Faleurine
I have a network of 4 computers, consisting of 2 64-bit Vista machines, a 32-bit Vista machine and an XP desktop. I have every single one sharing flawlessly, including files, printers, 2 computers on wireless internet and 2 wired through the router. It's stupid-simple. I have never had one problem with any of the setup processes for anything Vista or XP-related.
Vista has been good to me but I'm really looking forward to 7, still. I'm gonna install it soon.