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VMware Fusion will run multiple operating systems, including Windows, Linux, and Solaris, on a Macintosh along side Mac OS X. Here are some screen shots of Fusion in action.
Check out Larry Dignan's blog on Fusion.
Click on any screen shot to enlarge. Credit: VMware
Fusion for OS X will run many operating systems including Windows, Solaris, FreeBSD, and Netware.
VMware Fusion public beta is a free download and VMware is offering the final version at $39.99 for pre-order--with a suggested retail price of $79.99.
You can run any version of Windows.