I'm never without my HP 200LX - a real PC that fits in my pocket. It's got my phone directory, calendar, games, e-texts and many notes and databases.

On my belt I carry a Kershaw lock-back knife (but not when flying), Canon PowerShot S100 digital camera, and Motorola phone - I couldn't tell you the model but it's meant for use on the T-Mobile network. (And it's totally stupid that it gets dust inside the screen. I have had to pull the cover off it every week or two to clean it out.)

Pockets have the following:
ChapStick
spare pair of AA NiMH cells (for the 200LX)
keys to two cars
house and office keys
tiny LED flashlight
comb
Sakura pen (blue Micron 005 - .20 mm line width)
wallet full of credit cards, driver's license, bank cards
tiny Swiss Army knife (scissors, tweezer, nail file,...)
pocket money