If I buy a MAC Book

[GD]

can I dual boot it with XP OR 7?

[St. Jimmy]

as long as it's an intel chip set, yes.

[Triple A]

http://www.simplehelp.net/2009/01/15/using-boot-camp-to-install-windows-7-on-your-mac-the-complete-walkthrough/

Or you can just use like a "Virtual Windows" inside OSX: http://www.downloadsquad.com/2009/01/23/installing-windows-7-on-a-mac/

[Bad Company]

You could also get a PC

[GD]

Thanks guys.