Anybody have any particular items that they carry around with them, or use on a regular basis? Not necessarily multi-tools, just an odd piece they have? I only ask because I have a firing pin out of an old French MAS-49 that I carry with me. It's harder than woodpecker lips, tip is smooth, and works great as a punch, marlinspike, and odd tool. You could probably use it as a small kerambit if you chose. The thing I like about it is that people don't generally look twice at it, after the initial curiosity is done.

I also keep a P-38 can opener and a small set of sharp tweezers on my dog tag chain.