So this morning while delaying the bike ride (I wanted it to be at least 50 degrees as the cooler temps came on suddenly and I'm not quite acclimatized—I know, I know, I love cold weather, but I'm just saying) I popped over to Urban Sketchers to see what people were up to and there was this wonderful animated gif by Bo Soremsky. You should go and watch it now and check out the other links in that post.
I'm just trying to get my animated gifs to switch between a before and after, but Soremsky has made little movies using the animated gif technology. I love what he is doing.
Here's a link to a short narrative made with his sketches and this technique: Passengers: A digital narrative.