Just like Tinsel, I've got a batch of special invitations to Twinity: the first fifty people to sign up through this link get direct access to the Twinity beta - without waiting time. Why don't you give it a shot!
Personally, I'm still trying to get Twinity to run on Wine. I'd like to stay in Ubuntu as much as possible, and so far Twinity is the only thing I need to go to Vista for. Obviously, Twinity on Wine isn't supported by Metaversum, but if anyone gets it to work, I'd love to hear how.