Originally posted by G. Peretz
Emergency eject:
*Press the eject button on the keyboard. Once. Then repeatedly if once doesn't do it.
*If that fails, restart and hold down the mouse button. This *should* eject all but the most stubborn of discs.
*If that fails, restart to the Open Firmware prompt: Command+Option+O+F. At the prompt, type: eject cd
then mac-boot
http://docs.info.apple.com/article.html?artnum=106752