By the way, is it possible for you to describe a bit how you plan to make Ohloh profitable?

I didn't see anywhere how to get ohloh's source. Isn't it open source (after all, it's about open source)? If it is, maybe someone interested could add Mercurial support.

Mercurial is definitely a big player among the current revision control systems. I'd think Ohloh absolutly needs to support all of the major ones to be of any real value.