The latest buzz in the Intel-based Mac scene is dual booting Mac OS X and Windows using
Boot Camp. For those who don't think that three is a crowd, have a look at a recently posted guide to
triple booting Mac OS X, Windows, and Linux via Boot Camp. It's much more of a "roll up your sleeves" process than Apple's drill for doing the Boot Camp dual boot thing, and not for the feint of heart.
As with the standard Boot Camp procedure, we would advise that users backup any critical data residing on the initial Mac OS X partition before going down this road.