I, too, would be interested in see if 32 bit Vista works better.
So far, I dislike Vista. But I didn’t like XP when it was first out and now I prefer it. My problem with Vista is fundamental — too much of it’s core was designed to protect interests other than mine! With XP, my complaint was with product activation and, later, with Windows Guinuine Advantage. With WGA, it cannot be designed well enough to see the Microsoft sticker on the box that says I have a license to run this OS. To me, that trumps anything it finds scanning the inside! Vista goes much further trying to make sure I have a license for data files. Way too far.
I’m not sure that your observation shows ATI isn’t putting effort into dealing with problems; it probably only shows they are spread thin dealing with a host of problems this new OS is providing. I have hated that every version of Windows requires all new drivers but I do think Microsoft had a sufficient reason with Vista — provided they were honost about it.