windows vista is a resource hog, so i wouldn't recommend using it (for gaming reasons;))
i had to dual boot for a while this summer to run some software that only works on windows, and i absolutely couldn't stand working with windows after i was spoiled by ubuntu dapper, so i don't know how you do it, now my windows install never gets to execute any code outside vmware.
Vista is not finished yet, and will not be finished by its release date... we will have to wait at least half a year or so until it is usable after release. Serious gaming will harldly go on without it as direct3d10 will only come on vista and there is not even a usable direct3d9 implementation for Linux yet. Yes, I have tried Cedega...
I am using my machine at home 90% for gaming so I am kinda bound to windows. Otherwise I would happily run Gentoo...

At work I have to cope with Windows, Linux, MacOS and others... so I am used to all the good and bad sides of all systems. None of them is perfect, all of them have faults... it is just a decision of what you want to use your machine for which operation system to use.
I am not a windows fan, but I am not a Linux fan either. They are both not black or white but different shades of gray.
Danny