Another option people may want to look into is MP3 Book Helper. It's the tagging program I use, and the fact that you can use pretty standard regex in the tagging commands makes it nice and quick when you have a complicated rename.

Also makes it easy to do the multi-disc re-number trick:

Drag the ALBUM_CD1 folder onto the program, then the ALBUM_2, and tell it to start counting at 1. Nice and tidy.