Project updated! Fixed text lines going out of the frame with better indentation logic.
I'm currently working on a fold-out feature, too. It's not ready, yet, though.
Another similar project
Apparently, cdlabelgen is no longer being maintained. But there is this
Disc-cover project which produces very nice looking jewel case covers using a very similar approach to MP3-CD-Sleeve (i.e. using LaTeX).
If you're interested in this one, you should also see:
cdlabelgen that produces very nice looking front and back covers and
MPHPSleeve for browsing MP3 hierarchies (reading ID3 tags).
An open, cross-platform journaling program.
A scientific plotting package.