Wow...I thought I was anal...
I always bring and make sure they are in my carryon:
- Copies of my reservations (hotel, car, etc.) <------- but I broke that rule on my last-minute trip to Eastern Washington earlier this week...I forgot to print out my car reservation...I am human.
- Google Maps telling my sorry @$$ where I need to go.
- My cell phone (which reminds me, I should enter in the airline cs numbers into it...I've been meaning to do that).
- Anything important (haven't started copying my drivers license yet, though...) that I feel I'll need.