Feets, don't fail me now

The Futuring and Innovation Center team just the other day was discussing the idea of using a cellphone as a pedometer. Well, lookie here:

The latest Nike+ Air Zoom Moire runners can connect to an iPod Nano
through the soon-to-be released Nike+ Sportkit. The wireless Sportkit
receiver plugs into the iPod which can then display graphical
information on time, distance, pace, and calories burned. This data is
received from a sensor in the shoe, with audible feedback provided
through the earphones, e.g. Run Forrest run! Or, stop Forrest, just
stop will ya?

Well, why not a cellphone then?