What is this project about? From the NoseRub website:
NoseRub wants to be an inspiration, protocol and implementation of a decentralized social network.
Currently, the focus is on an example implementation (based on CakePHP 1.2), of which we could release version 0.5 last week (but there is still a lot to do, of course *g*). You can see it in action on identoo.com, or you can download and install it on your own server (it requires PHP 5).
Feedback is welcome :)