diff --git a/Source/OpenTK/Audio/OpenAL/AL/AL.cs b/Source/OpenTK/Audio/OpenAL/AL/AL.cs
index a978f01f..9a883150 100644
--- a/Source/OpenTK/Audio/OpenAL/AL/AL.cs
+++ b/Source/OpenTK/Audio/OpenAL/AL/AL.cs
@@ -65,6 +65,9 @@ typedef void ALvoid;
 
 namespace OpenTK.Audio.OpenAL
 {
+    /// <summary>
+    /// Provides access to the OpenAL 1.1 flat API.
+    /// </summary>
     public static partial class AL
     {
 
diff --git a/Source/OpenTK/Audio/OpenAL/AL/XRamExtension.cs b/Source/OpenTK/Audio/OpenAL/AL/XRamExtension.cs
index 27ae494f..95a64f85 100644
--- a/Source/OpenTK/Audio/OpenAL/AL/XRamExtension.cs
+++ b/Source/OpenTK/Audio/OpenAL/AL/XRamExtension.cs
@@ -14,7 +14,10 @@ using System.Runtime.InteropServices;
 namespace OpenTK.Audio.OpenAL
 {
 
-    ///<summary>The X-Ram Extension is provided on the top-end Sound Blaster X-Fi solutions (Sound Blaster X-Fi Fatal1ty, Sound Blaster X-Fi Elite Pro, or later). These products feature 64MB of X-Ram that can only be used for audio purposes, which can be controlled by this Extension.</summary>
+    ///<summary>
+    ///The X-Ram Extension is provided on the top-end Sound Blaster X-Fi solutions (Sound Blaster X-Fi Fatal1ty, Sound Blaster X-Fi Elite Pro, or later).
+    ///These products feature 64MB of X-Ram that can only be used for audio purposes, which can be controlled by this Extension.
+    ///</summary>
     [CLSCompliant(true)]
     public sealed class XRamExtension
     {
@@ -56,6 +59,9 @@ namespace OpenTK.Audio.OpenAL
 
         #region Constructor / Extension Loading
 
+        /// <summary>
+        /// Constructs a new XRamExtension instance.
+        /// </summary>
         public XRamExtension()
         { // Query if Extension supported and retrieve Tokens/Pointers if it is.
             _valid = false;
diff --git a/Source/OpenTK/Audio/OpenAL/Alc/AlcEnums.cs b/Source/OpenTK/Audio/OpenAL/Alc/AlcEnums.cs
index 8ff1cb9d..db298b3a 100644
--- a/Source/OpenTK/Audio/OpenAL/Alc/AlcEnums.cs
+++ b/Source/OpenTK/Audio/OpenAL/Alc/AlcEnums.cs
@@ -60,7 +60,7 @@ namespace OpenTK.Audio.OpenAL
     }
 
     /// <summary>
-    /// Defines available parameters for <see cref="OpenTK.Audio.Alc.GetString(IntPtr, AlcGetString)"/>.
+    /// Defines available parameters for <see cref="OpenTK.Audio.OpenAL.Alc.GetString(IntPtr, AlcGetString)"/>.
     /// </summary>
     public enum AlcGetString : int
     {
diff --git a/Source/OpenTK/Graphics/IGraphicsContext.cs b/Source/OpenTK/Graphics/IGraphicsContext.cs
index 66e9e63f..b0d86186 100644
--- a/Source/OpenTK/Graphics/IGraphicsContext.cs
+++ b/Source/OpenTK/Graphics/IGraphicsContext.cs
@@ -66,9 +66,6 @@ namespace OpenTK.Graphics
         bool ErrorChecking { get; set; }
     }
 
-    [Obsolete]
-    public delegate void DestroyEvent<T>(T sender, EventArgs e);
-
     // Functions for internal use by OpenTK.
     // TODO: RegisterForDisposal/DisposeResources for 0.3.15 (GC & OpenGL)
     // TODO: Remove or move GetDisplayModes to another class.
diff --git a/Source/OpenTK/Input/KeyboardState.cs b/Source/OpenTK/Input/KeyboardState.cs
index 9a2c87af..f97c7625 100644
--- a/Source/OpenTK/Input/KeyboardState.cs
+++ b/Source/OpenTK/Input/KeyboardState.cs
@@ -42,7 +42,6 @@ namespace OpenTK.Input
         // Todo: The following line triggers bogus CS0214 in gmcs 2.0.1, sigh...
         // Need to add a workaround using either ExplicitLayout or another trick.
         //unsafe fixed int Keys[NumKeys];
-        readonly int[] Keys;
 
         #endregion
 
diff --git a/Source/OpenTK/Math/Box2.cs b/Source/OpenTK/Math/Box2.cs
index 5bf223cc..cbc22b4c 100644
--- a/Source/OpenTK/Math/Box2.cs
+++ b/Source/OpenTK/Math/Box2.cs
@@ -87,6 +87,10 @@ namespace OpenTK
         /// </summary>
         public float Height { get { return (float)System.Math.Abs(Bottom - Top); } }
 
+        /// <summary>
+        /// Returns a <see cref="System.String"/> describing the current instance.
+        /// </summary>
+        /// <returns></returns>
         public override string ToString()
         {
             return String.Format("({0},{1})-({2},{3})", Left, Top, Right, Bottom);
diff --git a/Source/OpenTK/Math/MathHelper.cs b/Source/OpenTK/Math/MathHelper.cs
index 7837f572..4b303037 100644
--- a/Source/OpenTK/Math/MathHelper.cs
+++ b/Source/OpenTK/Math/MathHelper.cs
@@ -71,20 +71,6 @@ namespace OpenTK
         /// </summary>
         public const float Log2E = 1.442695041f;
 
-        [Obsolete]
-        public static readonly float PIF = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930382f;
-        [Obsolete]
-        public static readonly float RTODF = 180.0f / PIF;
-        [Obsolete]
-        public static readonly float DTORF = PIF / 180.0f;
-
-        [Obsolete]
-        public static readonly double PI = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930382d;
-        [Obsolete]
-        public static readonly double RTOD = 180.0d / PIF;
-        [Obsolete]
-        public static readonly double DTOR = PIF / 180.0d;
-
         #endregion
 
         #region Public Members