Still under testing, but Pocket Rendezvous will bring network auto-discovery to PPC which is a very cool idea! If you read through on the Gizmodo page you can learn how to get in on the testing.
Using Pocket Rendezvous, users can set up a personal, auto-discoverable web servers for a variety of purposes, such as matchmaking services (think broadcasted business cards or personal ads), private music streaming (be the mysterious F train DJ!), or anything else a crafty developer can build on top of the Rendezvous setup (iTunes, for instance, uses Rendezvous to do the quick-sharing of music libraries). [Gizmodo]