Good article on visual thinking by Douglas Coupland. I'm definitely a sanserif thinker, but tend to think in variable widths as they give a lot of variety for tone. Oddly enough, it's usually white text on a black background, or reverse, usually no color, as black and white have the strongest contrast and I'm all about the meshing point of contrasting ideas, shapes, etc.

via the excellently written and beautifully focused daring fireball.