Cool website that turns real photos into cartoons uvatar (looks more like you than a random avatar) and video cartoonizer (cool) which takes video and turns it into a cartoon. This should be another cool website to enjoy w/ your digital photography and eventually videos.
Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source.
An online suite of creative tools, including mind-mapping, cartooning, movie editing, audio editing. Requires an account; free version offers limited features of each tool.