I gave a presentation at MN.swf Camp on Peer-to-Peer communication in Flash Player 10. That presentation is now up on my presentations page. The Library that I created to simplfy the P2P commcunication is also posted on my labs page.
I also created two sample applications. The first is a Video Chat application that runs in the browser and the second is an Collaborative Shopping application that runs in AIR. The shopping application was created by Jason Grey, I just added the collaborative functionality.