I just installed FC 2 last night and ran into this same exact problem. For me, it turned out that the program 'lsof' was installed in '/usr/sbin/', which is not on the root path by default. Running the command '/usr/sbin/lsof /mnt/cdrom' revealed that fam was tying up the device and gave me an ID number to kill. After that, I was able to unmount my cdrom. The permanent fix would be to disable fam, which can be done by going to 'System Settings> Server Settings> Services' and unchecking sgifam.
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