I'm currently a subscriber here and have recently come into a position where having a 2nd public face to the site would be nice. I'd like to theme it entirely different but share the user base, rosters, etc... is this a feature or would I be stuck bying a 2nd site?
Unfortunately, the only way you could probably pull off a duplicate public face would be to use some javascript that loads the CSS File based on a cookie you set in.
Admittedly, it's not exactly a trivial thing, but it IS doable.