People have asked me if there is any reason why they upgrade to Vista and why its better then XP and all I can say is, Its not, XP is a FAR better OS. And I highly recommend not wasting time or money upgrading to Vista. The ONLY reason to upgrade to Vista (if you have a PC that can handle it) is for the next version of DirectX and Halo2. MS is pretty much forcing the Gamers to upgrade by making the next version of DirectX only for Vista, but I'm hoping someone will figure out a way to get it running on XP cause its not worth upgrading and I have a feeling we're going to see very few games come out that will be Vista Only.
I've been "trying" to beta test it and the OS is such a resource hog that it brings most of my systems down to a crawl. Which is funny cause according to MS compatibility tester for Vista my computers should all be fine for running Vista. I am an Official beta tester for Vista and Office '07. Office is pretty nice and I'm almost willing to say its worth upgrading that. But Vista you should stay FAR away.
The only system I own that can sort of run Vista is my 3Ghz AMD64 with 1.5GB of RAM and a 256MB PCI-e Video card. And even then it runs pretty shitty.
My work computer which is a 1.5Ghz AMD XP with 512MB of RAM and a 128MB AGP video card barely can handle it, it takes about 5 mins to open notepad.
The OS is a serious joke and very very very few people are going to upgrade. Its going to cost people almost the same price of the OS (most likely more) just to updated their computers to handle it.
On top of that I'm finding that alot of my games are incompatible with Vista. Yes thats right incompatible. When I go to run a game like Albatross18 it tells me that I can't run this program cause its a security risk and won't let me play it. What kind of BS is that? Seriously. In order to play any old games the developers are going to have to go back and make a new executable that is compatible with Vista. This is going to be a serious nightmare to any companies who have in house made software or are using old programs that are no longer supported.
Just stay with XP and don't upgrade to Vista, infact if you buy a PC with Vista installed on it downgrade back to XP. It will save you from so many headaches.