sorry for the slow reply, it's a macbook pro 13. Doing the restart eject thing doesn't work.
Shake it for all it's worth?
Small CDs and slot loading drives don't mix. The mechanism won't have caught it at all, so expecting it to eject it isn't going to happen.

The Wii seems to cope with it just fine when playing a old Gamecube game!![]()

Personally, if it's a MacBook I'd take it to an Apple store to see if they can help (you might have to open your wallet) rather than risk damaging the machine trying to get it out.