A Stanford AI student’s project. Also known as a remarkably good, free, web-based vectorizer.
I’ve only used it a bit, but here’s how it does on a lousy photo of a whiteboard drawing!
(screenshot from illustrator on the left, screenshot of a cameraphone-on-whiteboard photo on the right. Click for fullsize)
I can’t wait to try this out for cleaning up hand-drawn scanned stuff.
If you check out their site, you can see examples of more complex stuff and comparisons to the lousy results from commercially-available tools. It even does a bang-up job on photos and low-resolution images (the holy grail for people asking for redrawn logos).