Hangout.net - another room-based 3D virtual world

This is another room-based virtual world (working on both Mac and Windows!) , comparable with 3BRooms, Vivaty and JustLeapIn, seemingly addressing the teen crowd (their motto is "get a room"...) like Google's Lively does. Facebook App included. The music in the video on their homepage is a little annoying after a few seconds but it looks like they have better web and media integration than Lively (which is not hard, I admit). It is still in closed beta and I hope I can get an invite soon to be able to test it. It's been a Techcrunch50 winner and the official Metaverse evangelists of IBM Hursley have been playing around with it, too, so it could be a promising approach.