the .NET Framework source

[url]http://blogs.msdn.com/sburke/archive/2008/01/16/configuring-visual-studio-to-debug-net-framework-source-code.aspx[/url]

 

.NET Framework 3.5 open source partly:

[url]http://weblogs.asp.net/scottgu/archive/2008/01/16/net-framework-library-source-code-now-available.aspx[/url]

 

the .NET Framework source :

[url]http://talentgrouplabs.com/blog/archive/2007/12/10/the-.net-framework-source.aspx[/url]