A nifty group of template for various cards and boxes can be found at Mirkwood Designs. Useful for craft projects, no doubt, and the author does not mind if you sell products which use his templates. Rudimentary, but with some good ideas.

This origami CD case is more clever and more useful. I’ve used it a couple of times when I’ve needed a CD case for mailing, but didn’t have any handy. I’ve thought about making a PostScript template for printing them out with logos, perhaps I’ll get to it later tonight.