Great info via Lifehacker:

The guy who’s filling his notepad with drawings in the meeting? The coworker whose leg is running like a jackhammer? It’s possibly more than boredom or caffeine powering them. Some researchers suggest such activities actually help focus on a task at hand.

I doodle like a nutjob during our Monday morning sales marathons. Good to hear I’m not a nutjob.

But I probably am. A nutjob, I mean.

Fidgeting and Doodling Could Be Unconscious Focus Tools.