My solution: Turn off the MacBook Pro, and put it in a cool location for about five minutes. Then eject the CD as soon as the OS starts up. This has worked every time for me.
[robg adds: I've probably only ever had a few discs stuck in any of the Mac portables I've owned over the years, so I'm posting this as not only a hint but also a call for comments: are jammed discs somewhat common, and I've just been lucky to miss out on this problem? Or is this possibly a sign of a misaligned drive or other hardware related issue? Please share if you have additional information...]

