Lots of people are going to love this Vista feature - Restore Previous Versions.
Have you ever accidentally deleted a file? Or overwritten a file accidentally and wanted the old version back?
Larry Osterman discovered this Windows Vista's - Restore Previous Versions feature and shares the joy:
http://blogs.msdn.com/larryosterman/archive/2007/01/23/how-the-magic-of-windows-vista-saved-38g-of-my-data.aspx
See, there's more to Vista than IE7, improved security, some eye candy and high spec hardware requirements 