Parallels Desktop (for the Mac folks)

http://eshop.macsales.com/Search/SearchPromo.cfm?Ntk=Primary&Ns=P_ID|1&Ne=5000&N=5836&Ntt=HolidayPromo2009&APC=READERSPC&Source=Blast10Jan

On special for $55 by clicking the link. This is for the Mac people who
want to run Windows - but would like to be able to quickly switch back and
forth between Mac and Windows.