You do web dev on Vista? I hope you're running IE 6 too, because it's the most popular browser. You do know IE 7 is a little different right? Why you wouldn't use PS with one of the top Mac web dev apps, along with Parallels and/or VMWare for testing IE 6, 7, and FireFox for Windows, along with Safari and others on the Mac, I don't understand. I mean, your choice... but really? You know, Leopard is coming out soon. Should have some pretty colors like Vista too.
Sorry, but if someone wanted to do web dev and testing on a Vista machine where I work, they'd be laughed out of the building.