Slideshow drawing. Flickr has a page that plays a slideshow of interesting pics from the last 7 days. Andy Latham had this brilliant idea
I had been doing something similar importing a stack of jpgs into quicktime as an image sequence, setting it to 10 frames an image, and then playing it back at the slowest possible speed.
Good for sketching fast fast fast, wish I could find some kind of slideshow software that would go a little slower, 20 seconds is really fast. But still, better then nothing.