On Fri, Apr 30, 2010 at 5:38 PM, Gwern Branwen
Nothing in http://develop.github.com/ seems especially useful for grabbing the git:// URLs of all repos by language - just by user.
The only real list of repos by language seems to be gotten at via http://github.com/languages/Haskell/updated or http://github.com/languages/Haskell/created . (You might think http://github.com/languages/Haskell would be good, but no, it's just a few random repos by interest and not a full listing.)
Github has a REST API for accessing data. Unfortunately it can't give you the wanted breakdown, but I would ask them for it. It is much simpler for you, and it does not put an extra strain on their servers due to the scraping. Usually, the github guys are helpful when you have a question. -- J.