4Gb of memory for Vista is the 'sweet spot' for Vista
2Gb of memory is the 'sweet spot' for XP

Currently I use 2Gb of memory...XP is just extremely responsive
Vista however, there are slow-downs...

Anyways, anyone here having video driver crashes?
I update to the latest Nvidia drivers for my 7800 gtx and sometimes it crashes (screen goes blank, then the balloon pops up and says "your display driver has crashed. successfully recovered etc.)