If a CD or DVD is physically stuck inside your MacBook's or MacBook Pro's slot-in drive (e.g. when you've inserted a CD with a paper label) this tip might be useful:
When pressing the eject button the disc is moved a tiny bit and pulled back inside immediately afterwards. You can probably see only a very tiny bit if it, but that part can't be caught by regular tweezers or other tools available in a typical household. I also unsuccessfully tried some tips for removing a stuck DVD floating around the web.Instead, try to use the shutter of an old 3.5" floppy disc, and bend both ends of the shutter slightly outwards, so that the disc can easily slip between the ends. Now you have a tool that is thin enough to go a bit deeper into you Mac's slot-in drive. Press the Eject button and try to catch a tiny part of the disc with your newly-built tool. You should have a fairly good grip on the disc, and you can start to pull it out -- very slowly!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20080605013811670