Not impressed with Vista Ultimate. Lot's of eye candy but lame performance. Sp1 comes out this month but from what I have seen of the RC's there's not much improvement on things like file transfers and boot times, it's a resource hog and a lot of companies still don't have drivers or software written for it, the security stuff can be a pain in the arse to unless you disable a lot of it. I'm running it on a dual core gaming rig that I built and to be honest I would rather run XP Pro. (32 bit or 64 bit) Microsoft rushed this one out way to soon but then support for XP Pro ends next year.