I saw on the Exercise thread here that the newest "game" challenge is using a digital pedometer that communicates wirelessly to your ipod nano, then your nano posts the results on your computer...and your computer uploads the results to a website where you and your "team" can keep track of how many miles you've gone.
It's not the *most* accurate device since it's just a pedometer that relies on equal stride distance, but it does sound like a fun way to keep motivated, especially for those of us in 5k training. (It works on a treadmill too.)
I already have an ipod nano, and the chip is just $30 (you don't have to buy the $100 shoes - you can put it on your own shoes). They are starting a challenge in the Exercise forum, just curious if anyone else in THIS thread is interested?