Added Build.Tasks project that contains custom MSBuild tasks for the compilation process:

- DateStamp, which generates a version number based on the current date.
- DelTree which mimics RemoveDir but can delete non-empty directories on xbuild 2.6.x (which only supports empty directories).
- Run which mimics Exec but also captures stderr/stdout.

Source/Build.Tasks/Build.Tasks.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{CCE26215-7591-4CC3-8E39-9A08F8BF35E2}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Build.Tasks</RootNamespace>
+    <AssemblyName>Build.Tasks</AssemblyName>
+    <TargetFrameworkVersion>v2.0</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>..\..\Binaries\OpenTK\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>..\..\Binaries\OpenTK\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Documentation|AnyCPU'">
+    <OutputPath>..\..\Binaries\OpenTK\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <Optimize>true</Optimize>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Nsis|AnyCPU'">
+    <OutputPath>..\..\Binaries\OpenTK\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <Optimize>true</Optimize>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <CodeAnalysisLogFile>..\..\Binaries\OpenTK\Release\Build.Tasks.dll.CodeAnalysisLog.xml</CodeAnalysisLogFile>
+    <CodeAnalysisUseTypeNameInSuppression>true</CodeAnalysisUseTypeNameInSuppression>
+    <CodeAnalysisModuleSuppressionsFile>GlobalSuppressions.cs</CodeAnalysisModuleSuppressionsFile>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSetDirectories>;C:\Program Files\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories>
+    <CodeAnalysisRuleDirectories>;C:\Program Files\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories>
+    <CodeAnalysisIgnoreBuiltInRules>false</CodeAnalysisIgnoreBuiltInRules>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Microsoft.Build.Framework" />
+    <Reference Include="Microsoft.Build.Utilities" />
+    <Reference Include="System" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Run.cs" />
+    <Compile Include="DateStamp.cs" />
+    <Compile Include="DelTree.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="Common.xml">
+      <SubType>Designer</SubType>
+    </Content>
+  </ItemGroup>
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Source/Build.Tasks/Common.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' != 'Debug' ">Release</Configuration>
+    <BuildTasksPath Condition="'$(BuildTasksPath)' == ''">..\..\Binaries\OpenTK\Release</BuildTasksPath>
+    <BuildTasksLib>$(BuildTasksPath)\Build.Tasks.dll</BuildTasksLib>
+  </PropertyGroup>
+
+  <UsingTask AssemblyFile="$(BuildTasksLib)" TaskName="DateStamp" Condition="'$(Target)' != 'Clean'" />
+  <UsingTask AssemblyFile="$(BuildTasksLib)" TaskName="DelTree" Condition="'$(Target)' != 'Clean'" />
+  <UsingTask AssemblyFile="$(BuildTasksLib)" TaskName="Run" Condition="'$(Target)' != 'Clean'" />
+
+</Project>

Source/Build.Tasks/DateStamp.cs

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+using System;
+using System.Globalization;
+using Microsoft.Build.Framework;
+using Microsoft.Build.Utilities;
+
+namespace Build.Tasks
+{
+    /// <summary>
+    /// Returns a date stamp in the form yyMMdd.
+    /// </summary>
+    public class DateStamp : Task
+    {
+        string date;
+
+        /// <summary>
+        /// Gets a <see cref="System.String"/> represting the date stamp.
+        /// </summary>
+        [Output]
+        public string Date
+        {
+            get { return date; }
+            private set { date = value; }
+        }
+
+        public override bool Execute()
+        {
+            try
+            {
+                Date = DateTime.Now.ToString("yyMMdd", CultureInfo.InvariantCulture);
+            }
+            catch (Exception e)
+            {
+                Log.LogErrorFromException(e);
+                return false;
+            }
+            return true;
+        }
+    }
+}

Source/Build.Tasks/DelTree.cs

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+using System;
+using System.Globalization;
+using Microsoft.Build.Framework;
+using Microsoft.Build.Utilities;
+
+namespace Build.Tasks
+{
+    /// <summary>
+    /// Deletes directory and all of its contents.
+    /// Replaces RemoveDir task which exhibits different behavior
+    /// on xbuild compared to msbuild: the first requires an empty
+    /// directory, while the latter does not.
+    /// </summary>
+    public class DelTree : Task
+    {
+        string path;
+
+        /// <summary>
+        /// The filesystem path to delete.
+        /// </summary>
+        [Required]
+        public string Path
+        {
+            get { return path; }
+            set { path = value; }
+        }
+
+        public override bool Execute()
+        {
+            try
+            {
+                if (String.IsNullOrEmpty(Path) ||
+                    System.IO.Directory.Exists(Path))
+                {
+                    return false;
+                }
+                else
+                {
+                    System.IO.Directory.Delete(Path, true);
+                }
+            }
+            catch (Exception e)
+            {
+                Log.LogErrorFromException(e);
+                return false;
+            }
+            return true;
+        }
+    }
+}

Source/Build.Tasks/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Build.Time")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Build.Time")]
+[assembly: AssemblyCopyright("Copyright ©  2010")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("f1d4ac4c-e931-44f4-ac34-966f3ec505e3")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Source/Build.Tasks/Run.cs

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+using System;
+using System.Diagnostics;
+using Microsoft.Build.Framework;
+using Microsoft.Build.Utilities;
+
+namespace Build.Tasks
+{
+    /// <summary>
+    /// Executes specified process, capturing its stdout/stderr output.
+    /// Replaces Exec task which does not capture output.
+    /// </summary>
+    public class Run : Task
+    {
+        string command, args, wdir;
+
+        /// <summary>
+        /// The command to execute.
+        /// </summary>
+        [Required]
+        public string Command
+        {
+            get { return command; }
+            set { command = value; }
+        }
+
+        /// <summary>
+        /// The working directory for the command.
+        /// </summary>
+        public string WorkingDirectory
+        {
+            get { return wdir; }
+            set { wdir = value; }
+        }
+
+        public override bool Execute()
+        {
+            try
+            {
+                if (String.IsNullOrEmpty(command))
+                {
+                    return false;
+                }
+
+                // Split arguments from command:
+                int arg_end = command.IndexOf(' ');
+                ProcessStartInfo psi = null;
+                if (arg_end > 0)
+                {
+                    psi = new ProcessStartInfo(command.Substring(0, arg_end), command.Substring(arg_end + 1));
+                }
+                else
+                {
+                    psi = new ProcessStartInfo(command);
+                }
+
+                psi.UseShellExecute = false;
+                if (!String.IsNullOrEmpty(wdir))
+                {
+                    psi.WorkingDirectory = wdir;
+                }
+                
+                Process p = new Process();
+                p.ErrorDataReceived += LogErrors;
+                p.OutputDataReceived += LogOutput;
+                p.StartInfo = psi;
+
+                Log.LogMessage("Running {0} {1} on directory {2}",
+                    psi.FileName,
+                    psi.Arguments,
+                    String.IsNullOrEmpty(psi.WorkingDirectory) ?
+                        Environment.CurrentDirectory : psi.WorkingDirectory);
+
+                if (p.Start())
+                    p.WaitForExit();
+                return p.ExitCode == 0;
+            }
+            catch (Exception e)
+            {
+                Log.LogErrorFromException(e);
+                return false;
+            }
+        }
+
+        void LogErrors(object sender, DataReceivedEventArgs e)
+        {
+            Log.LogError(e.Data);
+        }
+
+        void LogOutput(object sender, DataReceivedEventArgs e)
+        {
+            Log.LogMessage(e.Data);
+        }
+    }
+}