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.
An Embedded View of the Mac mini