How Do I Eject My CD with No Eject Key on My Keyboard or Drive?
Q: How do I eject my CD if I don't have an eject key on my keyboard?
A: There are several ways to eject your Cd tray, the most common is holding down the F12 key or by clicking the eject button in iTunes. More information on these and more below.
Some newer 3rd party Apple keyboards are shipping with eject keys on them.
Q: I just bought a new CD/CDRW/SuperDrive and the unit is missing the eject key?
A: Apple shipped these drive without an eject key because it is not needed. You can eject your media from any keyboard by holding down the F12 key. You can close the CD tray the same way.
For more information on these topics please read this article from Apple