Two things I haven't got around to re-doing!
1 a GPO for setting the explorer window to open in the same window by default. (or GPOP)
2 Stop the Office installer for my users (no roaming profiles).
(well my users profile path is blank they can't save stupid wallpapers and logins are quicker)
I used to have these fixed by having the default domain user do it, but this caused problems later and didn't work with Vista Machines.