VectorMagic
There are two types of computerised image: bit-mapped images are composed of thousands or millions of small pixels while vector images are composed of lines, circles, curves, whatever. The two types have differing pros and cons: each of a bitmap’s pixels can be a different colour, meaning that a bitmap typically approximates a photograph better—but that same pixelation means that if you zoom in too much a bitmap is useless; a vector image can be zoomed in forever (at least theoretically) and its resolution never suffers—but it’s very difficult to use a vector image to represent a real view.
Enter VectorMagic. Given a JPEG of a photo or logo, it will produce a vector image. This is actually very cool stuff—it appears to do an excellent job with the test images I’ve submitted.

