Funny thread here.
The fact of the matter is that Volume Shadow Copy has been present since Windows XP, this new "feature" will mostly be a better management interface, so that people actually start to understand what it's there for, and how they can use it.
The joke is that for once, Microsoft actually beat Apple by having a feature first, but they made it so cryptic and inaccessible that very few people knew it was there and even fewer people knew how to use it. Someone must've gotten a boot up their ass from Balmer when Apple launched "Time Machine" and everyone went, "Oooooh!". "You mean we had this thing BEFORE Apple, and they're STILL getting the credit?! You're FIRED!!!"
Let's just hope, for the sake of Microsoft, that this feature will actually work - unlike how system restore was broken in W7 - so they don't get a hailstorm of complaints from users with lost data.
Btw, talking about how "W98 is faster than XP, use that" or "DOS 6.22 is even faster". No, no they're not. Being simple is not the same as being faster. An OS kernel needs to take advantage of the capabilities of newer processors, including new instruction sets, hyperthreading, multicore, 64-bit addressing, and so on and so forth. You CAN have more features and faster OSes at the same time, they don't all have to be Vistas.