@ fishy fiz: just what I was going to write. W7 is basically slimmed down Vista and everyone's raving about it like it was W3.1 -> W95 move... Wake up, Vista is not evil incarnate and W7 is not the greatest thing since sliced bread...
i have to disagree with your assertion. win7 is what vista should have been from the get go. more memory efficient, better games compatability, faster boot up, etc, etc. plus a few new tricks to boot in the ui.
i will admit vista got better after sp1 but the milk had been soured at that point. as a result win7 had to be created to shed those feelings.
win 7 even tho it shares the same minimum system requirements with vista can actually work fine on slower machimes (iirc it was tested as low as 700mhz maybe slower machines too) so it is very much more optimized than vista ever thought of being.