Been using Vista on three computers and no problems at all. Never crashes. What is Windows 7 going to do for me? For the record I regard Vista as vastly superior to XP.
Much, much faster for one. Faster even than XP in my experience.
Microsoft finally took one idea from Apple that they've been ignoring all these years: Have the new version run faster on the same hardware. I see a lot of pissed off OEMs as for the first time people won't have to buy new hardware to upgrade to the new Windows version if they want equivalent speed.