thanks skogenchick, actually the light shining on the sketch is just from photoshop, thought I'd play around a bit. its actually just a plain, black and white contour line drawing, which don't use shadows... the idea with them is to instead draw the contour of the shadow, instead of the shadow itself.
wow. that is seriously one of the neatest things on this site. the shadow effect is great and the sketch is perfect. is that freehand or traced? if its freehand then thats amazing.