Hi JF,
I've used a few Mac CD labellers recently, but my favorite is Discus (version 2.14). The 30-day Demo is bundled with Roxio's Toast Deluxe; but, you can download the Demo from:
http://www.magicmouse.com
(if the link don't work, just type out the address to your browser). I like Discus because it's easy to use and very easy to calibrate/align your printer. I use it with both my HP Laserjet and my Stylewriter-2200. Works great on both printers.
Full version will cost you $39, but you get even more cool graphics for your labels, jewel boxes, etc., on a Mac/PC hybrid CD to boot if you're bilingual.
Good Luck,
T.