Wow, this does look cool. Skin scan is an app on the iPhone or iPod touch that analyses a spot on your skin to examine if the spot looks like melanoma. Techcrunch has more of the details.
The app takes a picture of a mole on the skin, then uses a proprietary algorithm to look at the fractal-like shapes which exist in human skin (have a look up close, you can see little triangles in normal skin, honest). It then calculates if the shape of the mole means it is is developing normally, or abnormally thus in a into a potential cancerous melanoma.