A Multi-Seat Linux Box: This tutorial shows how to build a multi-head, multi-user Linux box using a recent distribution of Linux and standard USB keyboards and mice. Xorg calls this arrangement a "multi-seat" system.
four-channel GPS receiver using a repurposed FPGA board from a previous frequency synthesizer project. Connected to a PC running a console app, the receiver is capable of tracking four satellites simultaneously, which is good enough to capture lat, long, and altitude.