Make:

IBM has a cool series of articles where they build an embedded application using a Mac Mini. The application itself is the classic photo booth: you pay a bit of money, a flashbulb goes off, and a minute later you've got some pictures of yourself, or perhaps yourselves if you're out with a friend. More recent versions of this booth create more complicated pictures, adding additional features, such as overlays, or possibly adding video to the mix. The test application starts as a a fairly simplistic form of the photo booth application, with room for further development. By the end of this series, you'll be accepting money and printing pictures. Link.