Parallels is great. Simply great. Flawless, easy install (easier than installing Windows XP by itself, in fact) and easy to configure and work with. I’ve now got a Windows XP virtual machine running on my little black MacBook, and it runs XP in a window better than my old non-Apple laptops ever did.
I don’t have too many apps I need to run in Windows (most of them are Grey Dog Software sports sims), but it’s comforting to know that I can start an instance of Windows in mere seconds and then switch back to OSX when I’m done with XP.