I'm surprised I haven't seen this mentioned anywhere yet, but the GotDotNet site is working on a project which seems to be the equivalent of SourceForge for .NET component/application developers. They're calling it Workspaces and here's the basic gist of what they hope to accomplish:

GotDotNet Workspaces provides a dynamic online environment where professionals and students alike can collaborate on software projects without the barriers created by geographical or network boundaries.

You can find more details in the whitepaper available online. This is definitely exciting news. I know a project like Genghis could have benefitted from this today. According to the site, the project is due to go to beta in September 2002 and will go live some time in 2003.