Mac OS X Start Up Keys

This was so useful, I had to report it from nosheep.net http://nosheep.net/story/mac-os-x-start-up-keys/

C – Boot from the internal optical drive (CD or DVD)
D – Boot the diagnostic volume of the install DVD
N – Start from the Network (NetBoot)
R – Force PowerBook screen reset
T – Boot into Firewire target disk mode
X – Reset startup disk selection and boot into Mac OS X Server
Shift – Boot into “Safe Boot” mode, which runs Disk First Aid. A reboot will be required afterward.
Option – Boot into “Startup Manager”
Mouse Button – Eject (internal) removable media
Command-S – Boot into Single User Mode (command line)
Command-V – Boot using “Verbose” mode (shows all kernel and startup console messages)
Command-Option-Shift-Delete – Bypass internal hard drive on boot and seek a different startup volume (such as a CD or external disk)
Command-Option-P-R – Reset Parameter RAM (PRAM) and non-volatile RAM (NVRAM)
Command-Option-O-F – Boot into “Open Firmware”