I am looking to actually start working on my first social & network game.. and I heard about Peer to Peer Networking in flash Player... but i cannot find anything on the subject... if anyone knows a place that or they would like to put instructions here... that would be most gracious...
I would check out Adobe's Cirrus service. Also, have a look at the AS3MUL which is built around cirrus.
I put together a little demo app using AS3MUL. It was pretty easy to do; you can check it out here. Just open it up in 2 browser windows/tabs and use the arrows to move around.