I don't think it's really an either/or choice. You can have loads of forks on Github but still have a central place for those who just want to download code. I

I don't think it's really an either/or choice. You can have loads of forks on Github but still have a central place for those who just want to download code. I think the really cool thing about Github is that it makes it easy to experiment with the code in public. It also makes it very easy to collect up any changes other people have made and integrate them into a single tree. It will be interesting to see what happens with these projects. Hopefully there will be a few forks as people try things out then one person (or group of people) will step forward to manage an "official" release. Presumably that person would set up a website for them (or take over the existing one) and not use the Github project as the sole means of distribution.