Command-S Boot into Single User Mode 
Command-V Boot using "Verbose" mode (shows all kernel and startup console messages) 
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 Open Firmware to select a boot device 
Command-Option-Shift-Delete Bypass internal harddrive on boot 
T Boot into Firewire target disk mode 
C Boot from the internal optical drive 
N Start from the Network (NetBoot) 
Command-Option-P-R Reset Parameter RAM (PRAM) and non-volatile RAM (NVRAM) 
(mouse button) Eject (internal) removable media

ALSO: if you use open firmware password... you'll need this:
Startup Manager -accessed by pressing the Option key during startup
Enter commands after starting up in Open Firmware -press Command-Option-O-F key combination during startup.

http://docs.info.apple.com/article.html?artnum=106482

How to troubleshoot a computer with Open Firmware Password enabled
If you cannot access the Open Firmware Password application and need to troubleshoot your computer by:

Resetting the PRAM
Starting up in Single-user mode
Starting up in Verbose mode
Starting from CD-ROM

Then follow these steps:

Start up into Open Firmware by pressing and holding the Command-Option-O-F key combination during startup.
At the Open Firmware prompt, type: reset-nvram
Press Return.
When prompted for your password, enter it and press the Return key. It responds OK.
At the Open Firmware prompt, type: reset-all
Press Return.

The computer restarts and you are now be able to reset the PRAM and startup in Single-user mode, Verbose mode, or from CD-ROM.