Rob Griffiths has posted a thorough review of Parallels Workstation, the impressive new (and free while in beta) software that allows you to run other operating systems in a virtual environment within Mac OS X.
Overall Rob is very pleased with his experience. He first tested Windows XP and even posted a video to demonstrate just how well this software can run most Windows tasks within Mac OS X, even on his Intel-based Mac mini. Rob also points out some of the really handy and unique abilities PW offers, such as being able to use the same clipboard between Mac OS X and Windows XP - that's right, you can install an extra set of tools from Parallels (which many say should simply be included in the app's install from the get-go) that will allow you to copy in Mac OS X and paste into Windows XP, and vice-versa. Rob also tested various other OSs, including Fedora Core and Debian, and at one point has three running - usably, by his standards - at the same time.
It's a very interesting read, especially if you're interested in your Intel Mac's other OS capabilities. Check it out.