Mac OS X not ejecting cdrom
This is really one of the most maddening things that OS X does:
The disk "Foo" is in use and could not be ejected.
Try quitting applications and try again.
"Hey, you’re the damn computer — try telling me what those applications are! Try telling me what files are in use! Try letting me override!"
lsof -D /path/to/cdrom
instead, and then kill the process manually.