Myself, and usually a notepad and pen, except for in school. :P
What are some things that you always take with you no matter where you go?
I have a picture in my wallet of my family. It was taken when my mom was still with us. That picture goes with me everywhere. When i have to travel for work I always put it on the night stand in the hotel. It makes it feel like everyone came with me (:
My reading glasses, and usually a grocery list and a budget of how much I plan to spend...
An external hard drive that has my computer backed up on it in case I'm robbed or burnt to the ground.