This is really amazing - an open source, Linux based, bike computer/cyclometer, that does GPS, heart rate, power metering, and all the usual other cyclometer stuff (speed, distance, etc.). The system is fully hackable, an intended to be hacked. They are also using Ant +Four, which is like Bluetooth for bikes. I blogged about this more, including the link to the video showing it, the company, etc, etc., on my Mountain Monkeys blog. Check it out, quite cool.