You can find the tracker's homepage at Google Code.
I'm pretty amazed by this service, and I really can't wait to see what kind of Unite services other people can come up with.
Not knowing much about the specifics of this service, I wonder if it would be possible to create a network of "decentralized" BitTorrent trackers for redundancy purposes. Since a Unite service is easy to set up, just about anyone could run a BitTorrent tracker, and if several of them connected in a network of "trusted" trackers continuously mirroring each other, there would always be a tracker available even if someone disconnects a computer running the tracker.
Time will tell how far Unite can take things, I guess.