Nothing on my belt aside from a carabiner with car keys, but in my pockets, I have: Leatherman Skeletool - got this as a Christmas present, and damn do I love it. Light enough it's not a bother, and has all the things I need. Beats the crap out of the generic multitool I had previously. 3ft tape measure - you'd be surprised how often I use this 4 GB Corsair Flash Voyager - large enough to keep a dvd-image linux install on and then some keys, including a drum key. I've gone through several small pens, but don't have one currently. Used to carry a mini Maglite, but that died and I haven't gotten a replacement. My phone makes phone calls, and that's about it. As a student, I can't afford a heavy-use smart phone plan, so I keep it simple until I can.