I prefer XP, but most of that is due to Vista not having any feature I'm interested in. The drawbacks of Vista (including the performance of Aero) don't really justify an upgrade for me.
Key word "STATED."
They'll take it yes, but Windows will only use about 2.5 ~3 leaving 1g behind technically unused by the OS.
I would use XP over Vista for the simple fact that it's been patched and tested more than Vista, which is still being patched and updated for security issues, etc.
Does Fusion allow access to more RAM and microprocessor resource than Parallels? I can run a stripped-down XP or Vista OS VM with Parallels, but as soon as I start adding needy apps (e.g., Creative Suite 3), the VM won't load.
to tell you the truth I'd just use XP.... like everyone else has said... Its been out for a long time. Its already on SP2 its about to get SP3 (says PC Magazine) It has alot more compatability to variouse hardware and applications... other than that Vista is XP just not as matured, with a few more bells and whistles, and a nagging permisions system (UAC) thats gonna haunt you until you turn it off.
XP= Basic functionality and a more stable enviornment.
Vista= Pretty, oh oh look at me GUI, and a not quite up to date library of drivers as XP.