Overview
Microsoft have released significant parts of the .NET framework source code for developers using Visual Studio 2008. In case you've not been following the releases, this blog post includes links to configuration and hotfix resources.
Hotfix
Before you attempt to configure the source code, make sure you have the following patch installed:
Configuration
I'll not attempt to reproduce perfectly good instructions, so here's a link:
References
Also referenced:
Versions
Metadata