When I was in college I discovered the joys of steno pads -- one side for taking notes, the other for doodling. I have continued to use steno pads -- and doodling -- to stay on track when I want to focus on information that is being presented.
For the longest time my doodles have looked like this:

Lately I've experimented with a more flowing style that looks like this:

and this:

This article discusses doodling as a creative process, and this site is for fans of doodling.
Next time you're in a meeting, waiting for someone, or talking on the phone, give doodling a try -- I think you'll like it.