Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

I'll wait until Wanking Furiocity % is added before committing to further metrics.

You need a Fitbit-style activity wrist strap (or man-bangle as @Cycliste calls them) to get those metrics. A friend of mine helped develop the hardware for one, and referred to it as the Wankometer.