Very cool, thanks for answering. I just checked it out and found a few nice libraries there I didn't know about, so it's already earned a spot in my bookmarks. ;)
By the way, if you have any ideas for other niches this sort of site could work well in, I'm all ears. The only two I'm personally interested in doing so far are Rails (separate to Ruby) and Python, but I think there's a wide range of people who might like to make such sites themselves.
Why not parameterize it and let anyone do just that? Just a thought...