I'd just like to comment about the "new" features in Vista. I recently purchased a new notebook with home premium preinstalled, and my experiences have been lukewarm.
The OS "feels" nice, it looks nice, and it performs slowly, relative to XP. This is on a system with a go 7900gs and a c2d 2.0 gig cpu and 2 gigs of ram. Gaming is horrible, but this may be due to drivers - there are constant stutters in every game at almost every setting (I have to turn settings so low that I literally may as well have integrated graphics, if I want to get rid of the periodic, crippling stuttering in gaming).
As for new features, I clicked on the link another poster supplied, leading to a Microsoft page. That page does not support your argument that Vista has more "features," sir, please reread it. It cites security and usability nd such as features - when in fact it is less usable (fact: fewer pieces of software that function, NONE that work in Vista but not elsewhere; no dx 10 games). Security may have been improved - but I want a real analysis of security to make a judgement, not a bit of text on the microsoft webpage .... as if they could be trusted to honestly review their own product! HAH!
IE is more like firefox now. Um, excellent, I suppose. This is good. Is it a "new" feature? Is it more secure? Sorry, but about security, Microsoft products will remain second-rate as far as security goes. As long as they are the "top dog" and most people use their products, they will be targetted by malware writers. As long as malware writers target microsoft, you may as well just use linux for security, and save yourself some wasted time.
There are good points though - while the changes are unnecessary and a burden to learn, I think the manner in which settings are changed in vista is a step toward better intuitiity. The security changes "may" end up being better, but again we'll have to wait and see.
What other features does that microsoft page claim? It's better for small businesses .... how? Eh? I don't get it. I have done consulting for many small businesses and worked as a network admin for one large university, and I can't see a single way in which this is an improvement for anyone except gamers - and that improvement is yet to come, really, given the dearth of dx 10 games.
Vista is, however, much better today than XP was at a similar point in it's release. My copy of vista has not crashed ONCE. The gaming issues are probably NVIDIAs fault. So all in all I'd say, decent job Microsoft, even though I know you really just released this for money, since all of the "features" (DX 10) could have been put in XP if you really wanted to do right by your customers.