Uhm, that feature has been in Novell Netware since 1994 or os. And may I say that Netware still does it better than Windows does it. Netware creates a new version every time the file is modified, whereas Win dows creates new version at predefined intervals (like Time Machine does)
Well, if it isn't Mr. "100% unbiased". It does not help your position to act like a foaming at the mouth fanboy.
To claim that OS X is better than Windows on every single area imaginable is CRAP, UTTER CRAP.
Well, there are quite a bit of similarities between the two, like it or not. Yes, UI's are different, and TM uses separate hard-drive, but other than that, they are quite similar indeed.
The one cool thing that TM does and Shadow Copy does not, is to save data inside apps, like Address Book Entries.
Seriously: you should try to be a bit more objective here. Leopard is not the ultimate OS that trounces every other OS in every single area.