The Arduino is a highly versitile platform, and as such, it also supports Pong. Using three resistors, the sync and light values needed by a TV can be generated. According to the author, Alistair Parker, the Arduino can generate 100-105 pixels per video line, but due to memory restrictions, the actual resolution used is 35×14 pixels. In black-and-white.
As a nostalgic side note, it is worth noticing that such limited resolution and colourspace is enough to provide a challenging game play. All the instructions, including code and schematics are available here.