Since the Windows 7 beta is free (for a time), it's also a great time to play around with Windows on your Mac via Bootcamp if you haven't done so yet (like me)-since you don't have to drop money or pirate points on a legit Vista or XP license.
SimpleHelp's guide is exhaustive, save for one little tidbit: running the 64-bit version may take a little tweaking, depending on your machine. If your machine officially supports the Boot Camp 2.1 64-bit update (any recent "Pro" model), grab that for you driver install under Windows. Recent Macbooks may also require a new video and audio driver-find them according to these instructions.
If you have a Macbook Regular or any other machine with 64-bit hardware but no official seal of approval from Apple, this thread on Mac Rumors can help you. You can also just run the 32-bit version.