Gone totally over to Mac in the last 18 months. Only keep a windows laptop round so I can run software to fault find on the car. Vista was the initial driver as it really was a pile of ...
I now love my iMac and 13" MacBook Pro. Wouldn't go back to Windows and a PC again unless things radically change.
I find Photoshop CS3 is far, far better running under Mac OS X than Windows XP or Vista where it would lock up everything trying to do a large edit. Don't know what it's like under Windows 7 but I suspect they won't have improved the multi-threading in the Windows kernel that much.