Rich's Tongfamily (Richtong.net add-on)

Polar S720 Heart Rate Monitor. Wow, it is amazing what a heart rate monitor can do. This one combines a cycling computer with an incredibly sophisticated heart rate monitor.
I have a Campagnolo Ergobrain and a Suunto Advizor, but this is both of them. Only issue is that the Ergobrain is integrated into the bike levers, so you don’t need to move to push. On the other hand, this thing actually has strain gauges on the pedals to measure power. It also has cadence and IR bi-directional to a PC.
All that for $200 or so. Cool.