Here's a hint ... don't put a mini CD in your MacBook! If you do, like I did, and it gets stuck, like mine did, well ... I managed to get it out by turning my MacBook on its side and shaking it.
[robg adds: Mini CDs (and any other non-standard CD size or shape, for that matter, should never be put into a slot-loading CD/DVD drive on any Mac that is thus equipped. If you have a tray-loading drive, I think the Mini CD format might work, but I haven't tested one myself.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20070418094057496