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Re:Gemcutter to become default gem host by Jim_Neath on Monday October 26, 2009 @11:36AM (#903389)
I don't know how useful this is, in the case of gems, but you can see the 30 (I think) most popular projects on github, based on number of forks or watchers:

http://github.com/popular/forked http://github.com/popular/watched

Re:Gemcutter to become default gem host by charlesju on Monday October 26, 2009 @02:09PM (#903756)
That's where I got the idea from. I was really excited to see what the most popular projects on github were, but this is just the tip of the iceberg b/c they refuse to show the complete leaderboard breakdown.