I have to laugh at quite a few of the posts made in this thread.
I would be surprised if anyone can give an example of a modern, up-to-date OS for the average uses of a computer that doesn't have a similar resource footprint to Windows 7.
Well my ubuntu 9.04 laptop boots up in 22 seconds and is using about 250 Mb ram. Vista on the same machine takes 4 minutes and 30 seconds before it reduces the hard drive access enough to let it have enough resources to give me control of my mouse pointer. And its uses over 1 gig of ram. '7' I'm told boots faster and uses less ram than Vista. But I'll run down our City Mall butt naked if it beats Ubuntu. Now THAT would be surprising.