Complete List of .NET Framework Classes

I've been looking for a way to quickly get an overview of all classes available in the .NET framework, since there are many I am not even aware of. The links below come closest to what I was looking for:

• http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/cpref_start.asp
  the official reference, broken down by namespace; good (of course), but a little difficult to click through; probably the best place to start, since each namespace and class has a brief description
• http://www.dotnetspider.com/technology/namespace/
  provides a user-submitted partial list of classes with examples and brief explanations
• http://www.dotnetframework.de/lserver/classreference.aspx?g=dotnet
  complete list of classes broken down by version, but without descriptions :(