Parallels Workstation 2.1 Beta for Mac OS X is NOT simply a “dual-boot” solution; rather, it empowers users the ability to use Windows, Linux and any other operating system at the same time as Mac OS X, enabling users to enjoy the comfort of their Mac OS X desktop while still being able to use critical applications from other OSes.
All you need is an Intel Mac and you can run Mac OSX, Linux and Windows Xp all at the same time. Very sweet.