Windows 7; The answer to H/W upgrades ??

So Microsoft release the Beta 1 of Windows 7 their upcoming OS after Vista. Its smooth looks like Vista and runs on H/W which gives sluggish performance on XP !!! I have decided if MS keeps up the speed of this OS just as it is now then I’m gonna buy it for each and every machine I own. Till then I’ll test it on my laptop having a 1.66 GHz Duo Procesor and 512 MB RAM on a 945 Chipset eek  !!!