bird and moon: A story told in comic strip format in a wordless style reminiscent of one of my favorite books ever, Kid Koala's Nufonia Must Fall (trailer - swf).
Another good example of wordless storytelling (this one not entirely safe to be consumed at work -- though that's exactly where I'm reading it) is When I Am King at Demian 5. It's the first link on the page. I can't link directly to it, as it uses javascript to open a window that is integral to the presentation, which by the way is very cool.