Steal this idea: iPhone Pedometer
An idea I don’t have time to pursue right now:
The new iPhone SDK, which gives developers access to the accelerometer, should make it easy to write up a little iPhone pedometer application.
Just tell the app your stride length, turn it on, slide the iPhone in your pocket, and away you go. A friendly display can show your number of steps, approximate distance traveled, a reset button, a history log, and a picture of a puppy. Because who doesn’t love adorable puppies?
Edited to add: Nevermind. Rogue Amoeba reports:
… the SDK agreement expressly forbids using non-public APIs, attempting to touch other applications, and running in the background, among other things.
No running in the background makes a pedometer useless.
Lawyers and software. What a great combination.

March 8th, 2008 at 3:48 pm
Your wish is my command.
http://code.google.com/p/iphone-pedometer/
Sure it isn’t using the “official” SDK and all that but who needs “official” anyways.