If you haven’t tried the latest rev of Ubuntu, 9.04 do so - it’s amazing.
I might get Windows 7 for the kids computer, but personally I’m finally loving linux on the desktop (and this is from a unix admin).
This might sound stupid but will there by a system update for Vista users to this Windows 7? Not that I want it, just curious.
Have 9.10 Beta running here as well as 9.04...and the Beta is behaving nicely as I type this and has a few new features.