Habbo is for 13-18 year olds (and probably younger but they probably have restrictions so the youngsters say they're 13). Second Life captures an older demographic (not sure of the stats). The market seems ripe for some newer competition. Something like a Linked In in a virtual world.
Hey Reelman,
I'm the TrackSuit CEO, the first company I started is EmployeeInsider, an online job rating forum for all industries. I'll write more about it later (tomorrow?). I've since run several businesses. I do SEO contracting and most recently I've done marketing through one of my companies for ridester.com
Thanks for the comment!