Limit what you're carrying to a small mobilephone, 1 & 2 keys and a single creditcard. Fits allmost anywhere.
Easier said than done. As it is, I don't think I'm going to get rid of my P800 anytime soon, and the whole point of that was to eliminate the need for me to get a PDA. My keys are actually not a problem, as I enjoy carrying them on a carabiner that hangs from a belt loop. I can put any number of things on there and it won't bother me.

As for carrying a single credit card, I wouldn't feel very secure. I just know I'd always be checking my pocket to make sure it hadn't slipped out when I sat down somewhere.

Nah, I'm someone who likes having his stuff with him. Especially his gadgets
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Matt