We were asked to avoid posting this until the servers were stable, and have gotten to go ahead to send you all in. Pony Town is a simple top-down hang out spot where you can customize a pony and go blabber away with fellow MLP fans. Since it's first iteration a few weeks ago, it has had extensive customization additions.
Head on over here to check it out!
(Someone get me some bat wings! My pony has fangs, but no bat!)