Besides my Glock 17 with extra mag. I carry a Zt 0301, Camillus Blaze, Small SAK, Surefire E2e, Leatherman Wave, Cellphone, Keys with a Swisstech Key, and a Pen..!!!
If on my immediate person, I usually have either LCP, or G23, a Leatherman E302, Leatherman Crunch, iPhone, Bic lighter, chapstick, Visine, and a Fenix LD10.
My Maxped Jumbo is packed with all kinds of other stuff like my M&P9, extra mags, video camera, Fenix TK21, binoculars, first aid kit, extra C123 batteries, and whatever else I think I might need in a crunch.