I carry a lot of stuff in my pockets every day. Well, *I* think it's a lot. My own issue is not so much weight or bulk as some of my stuff getting damaged by other stuff.
In my front right pocket, I carry my wallet (slim 'card case' type) and a Zippo (I don't smoke but you never know when you need to start a fire - or light a cigarette for a pretty woman!). I clip my knife-of-the-day to the top of my right pocket (I'm a grad student, so I usually only carry my Spyderco Meerkat, a 2"-blade folder, but I carry 3"-blade folders on weekends or off-campus).
In my front left pocket, I carry a Leatherman Squirt P4 and a tiny sewing kit in a little leather pouch I made myself out of Tandy Leather Company components (a paracord fob is tied to the Squirt). Also in this pocket is a bandana or hankerchief and my flashlight of the day - usually an Inova X1 or an 8-LED Chinese-made aluminum flashlight from lighthound.com
I keep my keys on a carabiner clip I clip to a belt loop, or place in my backpack when I'm on campus. On my keyring is a Photon microlight, a compass-whistle-thermometer from REI, a military-style can opener, and 2' of 550 paracord in a Chris Reeve knot.
I carry a cell phone in a belt-clip carry case. If I'm at school, it's in my bag with a Leatherman Wave. If I'm out and about, I'll clip it to my belt or the top of my left front pocket.
I always think of getting some kind of belt carry case, but I've never found one that didn't make me feel funny, like I'm wearing a utility belt or something!