I just have my trusty Cannon PowerShot S110. It is an inch think credit card sized camera, so it fits in my pocket and goes with me all over the place. It is only a 2mp with only 2x optical zoom, but it is portable and works great for short shots of me and friends and robot parts, which is what I wanted from my camera- candids of what I am doing.
That said, I am not a photographer, I just take pictures of things I see and keep them on my computer. I go back and look at them later and it helps me remember.
Wetzel