Required:
BP Cuff (L. cargo - this thing drives me crazy, it rubs my leg raw, but they tell me to have it with me, so there it is), stethoscope (R. cargo), O2 Key (R. shears pocket), black pen (shirt), penlight/flashlight (LED, works as both), trauma shears (R. shears pocket), at least 2 pairs of gloves (R. front pocket), ambulance keys (hooked to D-clip on my belt, otherwise they fall out everywhere), portable radio (anywhere it fits, which is usually nowhere, maybe someday I'll get a belt clip)
Not required:
Area map (R. rear pocket), quick reference guide (R. rear pocket) which I've never used), wallet (L. front cargo) and house keys (clipped with the ambulance keys). Once in a while I actually remember to grab my cell phone.
I always use my left front pocket as my portable garbage bin. I just clear it out whenever I'm near a non-portable.
Not very exciting...