Well, I stayed up late playing Civ IV, and there in my mailbox when I finished was a Pownce invite. I have a few left, so if you're curious about it, send me a request and I'll drop an invite. It's a lot like Twitter, but without an API (yet - supposedly one is coming). Until then, it's more or less a semi-closed beta.

Still - I'll keep my eyes on it and see what develops.