Good news,

ScottGu has publish a post about .NET framework 3.5. He has announce the .Net Framework 3.5 will be open source and can be accessible all codes from visual studio. 

It' means we can debug all CLR codes on our project.

To learn more about our source release plans and how the above debugger integration works, please check out this Podcast that Scott Hanselman and Shawn Burke recently recorded.  Shawn (who drove the source project on my team) is also going to be publishing a cool Channel9 video later this week that shows using the VS 2008 integrated debugging support with it.