I keep a few throwing knives and a deck of cards on me (gambit style). As for anything else well...have you seen the way our streets look nowadays? and if you take into account the every so slightly (cough) decayed look that has been presented thus far for the mean streets, well, there is a multitude of ammo laying around everywhere for a throwing adept, thus the reason i like Nimble Fingers so much. oh, wait, i need ammo, pick up a soycafe can from the dumpster next to me "That will do"
A deck of cards, toothpicks, a bag of steel ball bearings...pillows of DOOM...Earplugs...A bag of sand (Flechette rules)