A Vista tip? Blasphemy!
Well, I'm just trying it out at work, and it seems to be ok so far. But I got annoyed with the new Alt+Tab. I don't know what people's obsession with window thumbnails are, but to me they make all the choices look similar, where as icons clearly differentiate things.
Anyways, turns out you can just bring back the old alt+tab switcher with a registry hack. Just add a DWORD to \HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer called AltTabSettings and set it's value to 1.