The Nite Ize SkullKey is a key-sized multitool made from stainless steel. It consists of a scoring point, bottle opener, file, serrated edge, and #2 flat head screwdriver, all in a compact design that easily attached to a key ring. As a bonus, it looks pretty cool.
www.niteize.com/product/DoohicKey-QuicKey-SkullKey-Multi-Tools.asp