The Open Bike Computer, or OBiCo is a fascinating new bike computer project. It can be used as a normal bike computer, of course. But it can also be used as a heart rate monitor (taking input from Polar and Sigma brand chest straps), a music player (it plays OGG as well as MP3) and a GPS receiver. It takes an external memory card (the widely available micro-SD card), has a high quality TFT screen and a USB interface for connection to a PC. The USB connection can be used to charge the intern