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I notice that I can link to github, but not codeplex. Given the large number of .net developers on this site, I think a link to codeplex should also be available.
Give it time. Github is still experimental. I'm sure that if it works out, other sites will be added.
We want to do Codeplex, but I don't see an API for them. We may resort to scraping.
Update: they created an API and this has been implemented.