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As mentioned a while ago, Microsoft is releasing parts of the source code of the .NET framework which will allow you to debug from your code directly into the .NET framework source.

One of the best things is that you don't have to install everything onto your PC but can tell Visual Studio 2008 to get the symbol files from a server.

All it takes is the installation of a Visual Studio 2008 QFE (KB944899)  and some configuration inside VS. I tried it today, it works like a charm.

To get started, have a look at Shawn Burke's post "Configuring Visual Studio to Debug .NET Framework Source Code".  Make sure to have a look at his "Advanced Users" section which contains some very interesting information on how and when Visual Studio loads the symbols from the server and how you can influence that.

Scott Guthrie has written a good post on the subject as well. As always worth a look! (I feel like a suck-up now...)