In less than two years the Raspberry Pi has sold more than 1 million units and become widely used and adored among DIY hackers and embedded professionals alike. It began in 2006 as a modest idea to provide a low-cost educational computer for students to tinker with. Now the $25 Linux-based single-board computer is the basis for all kinds of gadgets from near-space cameras, to open source spy boxes, to the PiGate, a full-scale Stargate replica.