Well, I have to say, it works perfectly for me on a Sun Ultra 20 with 4GB RAM, ATI graphics, nForce chipset etc...nothing wrong with it what so ever.
I think a lot of the 'problems' on here are due to user error, cheap hardware, bad installs, lots of shit installed..etc. Someone above said that they had a corrupt ntoskrnl.exe, well that is most likely bad RAM or a bad disk which has caused that. Vista HATES bad ram, and it also hates cheap hardware. ECC ram is a good idea for Vista too, it certainly increased the stability on mine.
People switching to Linux? Please......whatever...lol. Hahahaha! Rofl! Pmsl! If you can't get Vista working then you are completely screwed with Linux, but feel free, and live with problems for the rest of your computing life.
I think I have tried every current OS out there for desktop PC, and the only 2 that I have stuck with is OS X and Windows (XP and Vista).
I have used Linux off and on for years, ever since Red Hat 5 actually and yes, while it is a nice geeky toy and it might make you look clever, it's not much use in the real world, unless you are running a server, and even then it is a pain in the arse. I can't really think of anything good to say about Linux on a desktop...um...incompatibilies, messing around, things not working, no decent software....but the fanboys will defend all that naturally, because they are used to working with lower class software.
However, the reason why I have OS X is because firstly I have a Mac Pro, and it makes sense to run it on that, also, it is simple, easy, normally 'just works' and is rock solid stable.
The reason why I have Vista is because it is a dependable, reliable stable operating system, which is easy to use and 'just works' most of the time also. Also, there is a lot of software available for it, and it runs perfectly well on my hardware, probably because it isn't cheap junk. For information as well, a fresh bootup of Vista uses less RAM than OS X by about 500MB. So which is the most bloated there? ;-)
All OS's have their good points, and all have their bad points. I think Vista gets a lot of bad press about nothing, as it runs perfectly well and is very stable on good quality hardware with plenty of RAM, so if you have problems, think to yourself, maybe it is my £200 laptop and not Vista that is at fault...
Anyone that has half a brain, and a decent box, install SP1, you will not regret it...