Yes, modern Macs are able to reboot into XP/Vista, or even run XP/Vista in a window under the OS X desktop, but the first option cuts you off from all of your Mac apps and the second option produces quite a bit of overhead (and both options makes you feel... unclean).
So, I'm wondering now if there is any chance that Elemental will see a Mac version?
Also, I'm not talking about cheating with Cider as EA does (it's so much like option two above), but rather a proper port like for example, most recently with Call of Duty 4 released by Aspyr. i5Works did the port for that game, and you can find them here:
Though perhaps, as with COD4, Elemental will get an OS X port about the time when Elemental 2 gets released...