Some of us already have Vista.
(Obvious.)
I don't really like it any better than XP, to be honest. I hardly even use it. It doesn't seem to be anything particularly special in any way. There isn't really significant changes to the overall theme to warrant an immediate change from XP to vista for most people. Unless you must have Vista, I'd recommend waiting. The same thing happened with XP at launch, and they had months to get SP1 out. The biggest thing with XP was buggy drivers.
I currently have Windows XP & Vista set in a dual-boot configuration on my laptop.
I also run virtual machines with anything from Windows 1.02, 3.1 & 3.11 for Workgroups, 95 and 98SE.. (Inside of XP.)
I don't see anything special about Vista, not enough to warrent the $200-300 it'll cost when it comes out soon.
~~Azurith