More than any other craft, to me illustration represents a convergence of the two halves of my psyche - the so-called "left brain" and "right brain". Illustration forces me to call upon technical skill, while tapping into the creative mental faculties required for art.
In addition to illustration, I've created a few logos for friends and small companies, some illustration work, and of course conceptual artwork on one of the dozens of stories I'm currently juggling around in my head.