I actually love Vista. Definitely less buggy and does not hang as much as XP.
I am currently using Win7 (dual boot), so I won't lose any current data I had/have with Vista.
First impression- I have no idea how to share/create a network amongst the 3 computers in the house. lol.
I don't really like the new taskbar/quick launch. I can never tell whether it's a tab or an actual quick launch icon. I guess Win7 takes time getting used to.
But FireFox looks more 'aero' like compared to when it's on Vista.
edit: i think win7 totally revamped the whole system tray / taskbar.