Hardly the best prepared or equipped, but I do keep some must-haves at all times:

BACK LEFT POCKET Bandanna

LEFT FRONT POCKET Tube with 10 Glucose Tablets (Low blood sugar is no fun, it's knocked the wind out of my sails at some bad times)
Bottle of contact lens-rewetting solution
Chapstick (in winter)

RIGHT FRONT POCKET
Mini Bic
Folding locking blade knife, half serrated
Car Keys
Keychain with Leatherman P4, Mini Maglite Solitaire or Photon Micro Light, Metal pill box with spare Lexapro (VERY good precaution for me), generic immodium, Claritin redi-tab (melts in your mouth, no water needed!) Pepto chewable and ibuprofen

BACK RIGHT POCKET:
Wallet...spare car key, credit/debit card. Currently NO scrap paper in there, I cleaned a TON out of it last week and my butt thanks me! <img src="/images/graemlins/laugh.gif" alt="" /> But I couldnt help but think 'what great potential tinder!' And about $40 in cash. Not carrying cash used to be a BIG thing for me, but now I try to keep close to $50 hard currency on hand at all times!

On my belt, my Leatherman Wave. And sometimes my cell phone, but I usually leave it in the car, or my locker, or a jacket pocket. It's always within 100 feet, and my workspace is so tiny and cramped that I've smashed it against a wall countless times when I keep it on my belt....!

EDIT: Left Wrist - a Fossil Blue watch, and sometimes a pink elastic breast cancer bracelet.

Hmmmm...I may do a photoshoot of my stuff too, with my snazzy new digital...! <img src="/images/graemlins/grin.gif" alt="" />