In case you hadn't heard already (and are brave enough to try it out), there's a beta patch to run a carbonized UT under MacOS X natively:
http://westlakeinteractive.com
(good luck getting to the URL though, I got in earlier, but can't even get to it now)
http://westlakeinteractive.com
(good luck getting to the URL though, I got in earlier, but can't even get to it now)