This page has Linux shell scripts that may be useful to others.
This file will combine all tracks in the $HOME/mp3/noartist/unknown_disc/ directory into one ogg file. It is useful when ripping symphonies from CD, when divided into several tracks. To use, I run grip on the disk without checking CDDB, run the script, then label properly from xmms. This script is saving me about 15 minutes per CD.