I'm not one for promoting products but I found this quite intersting/funny...

Automatic CD/DVD Shredder

Protect your sensitive data


Many of us have turned to the almighty paper shredder as a easy measure to keep prying eyes away from sensitive data. Now you can do the same for the data you have stored on your CDs and DVD-ROM disks as well.

Simply feed your disks into the CD/DVD shredder before disposing of them to ensure that the data on that disk will be unrecoverable. While you won't end up with the confetti you find with a paper shredder, your disk surface will be sufficiently scratched and dimpled enough to prevent recovery of its data. The truly paranoid can run the disk through on repeated passes, though we've found that a single pass will suffice.

http://www.thinkgeek.com/gadgets/security/6d7f/