Some of us need Windows apps too. One of the biggest for me is Quicken. The Mac version of Quicken seems about a decade behind the Windows version development-wise. Dual booting just to get at Quicken seems like an awful lot of bother; it's easier to just keep an old WIndows machine running and access is using Remote Access, however, even better would be to run native Windows Quicken in a vmware-like window under OS X.