I’ve just started using Pownce. I think it’s great for jotting ideas, links, and events with like-minded friends - your own personal Digg. Let’s just hope the company I work in does not ban it like how they recently did with Facebook. NY Times has an interesting article on Pownce, from the article :
I learned you can send text messages to individual friends or groups of friends on Pownce as well as post microblogs, or short announcements, to the larger Pownce community. This function is very similar to messaging services like Twitter or Jaiku, and is found on social networks like Facebook and MySpace (although Pownce’s messages cannot, at least for now, be sent to mobile phones). You can also send your friends links, invitations to events, or files like photos, music or videos. Of course, you can already do that on a multitude of file-sharing Web sites. It is the combination of private messaging and file-sharing that makes Pownce so novel.
For now, Pownce is by invitation only. Unfortunately for anyone wishing to join, I’ve already run out of invites. Drop me a note if you want an invite, and I’ll contact you once I receive more invites.