The DVD/CD Shredder from Alera Technologies destroys the data layer on DVD and CD discs, making the data unrecoverable. Pretty much any size DVD or CD is handled, including 120mm, 80mm, and even Business Card size. It'll set you back $39.99. I've been saving quite a few CDs to send off to be recycled, and for the CDs that actually contain old personal data, this might not be a bad idea. (via Macintouch)