1. option + apple + Eject = sleep immediately
2. control + apple + Eject = shutdown and reboot immediately
3. control + Eject = shutdown/restart dialog box (like hitting the old power key used to do).
The only combination I can't find is "shutdown immediately." I don't know if these key combos are posted anywhere, but I never heard of them before. I began experimenting with some other keys:
4. option + (any sound key) = open audio alerts panel in system prefs
[Editor's note: A couple of these have been published here before, but a couple of them are new to me, too...]

