Everyone should get this:
What is it?
Pownce is a way to send messages, files, links and events to your friends. You'll create a network of the people you know and then you can share stuff with all of them, just a few of them, or even just one other person really fast.
Joining is by invite only. (for now) Ask me for one, or check out pownce.com and sign up to receive one.