A very unexpected port of DOOM has hit all Digita OS cameras (excluding the Kodak DC220). Just load a commercial or shareware WAD file onto a CompactFlash card, install the software, and you’re ready to play. This guy even mapped various game keys to all the digital camera buttons. Download here.
“This version of Doom runs on Digita based cameras. It is based on the Doom source code released for non-profit GPL use by John Carmack December 1997.”