Sticky Note Drawings
I have been drawing on sticky notes (Post-it notes) and posting them online for over two years now. I like the format; it forces the drawing to be simple, and the concept to be focussed. It's not so much about the craft of drawing, but more about the idea, boiled down to just the essentials.
(May take one or two seconds to load - if you don't have Flash installed, view the drawings on Flickr)