Keyboard Shortcuts for OSX

From The System Administrator Zone

1: Immediately Reboot Mac OS X
Control + Command + Eject (or Power Button)

2: Immediately Shutdown Mac OS X
Command + Option + Control + Eject (or Power Button)

3: Immediately Log User Out of Mac OS X
Control + Option + Shift + Q

4: Immediately Put Your Mac to Sleep
Command + Option + Eject (hold the buttons down for 2 seconds, use Power button if no eject key)

5: Immediately Shut Off Your Mac Display
Shift + Control + Eject (or Power Button)

6: Instant Shutdown of the Mac (Alternate Method)
Hold down the Power button until the Mac is turned off