Traveling...
I hate lugging lots of things around. Reading a thread on photo.net entitled "what is your travel kit & why?", I read this comment and thought it was interesting.
I usually carry copies of previous work that I think will make me friends. If you can't speak the language it's a real help, and even if you can, it help with those "what's this guy taking our pictures for?" moments. Usually just photocopies, nothing fancy.
On another note, before last year, I used to take my F100 everywhere, but after spending the past week with the FE, I had tons of fun with it. Should have a few images off of it next week.