I just got UT 2k4 and, I've got to say, it's a great running game for Macs with a steady population. Now, I've seen videos on youtube of Mac users playing this game with dual monitors, and I'm very curious to know how to do it! It probably won't be such a good idea during online play, but...I'm curious. Anyone have any idea how to make this happen? Here's a youtube video showing it.