This is technically interesting, but I like the friction (small as it is) of forcing a software project to maintain a Web site. It may encourage people to think before forking, and a well-maintained Web site shows that someone somewhere is at least minimally committed to the project.
I think making forking cheap and easy is a good idea. Sure, bad forks will be made but, Git would make it easy to merge the fork's changes into a trusted stream.
IMO a trusted stream should have more than PGP signatures behind it; it should have some commitment. It seems like GitTorrent is trying to eliminate that part.
