nPower PEG -- Any thoughts?

I saw this ad and wondered if anyone had ever seen or used this gadget. It claims to generate electricity by converting the kinetic energy from your movement. I know that there are things that can be powered that way, like watches, but it's the first thing I have seen that was touted for recharging of personal electronics. Here's a link nPower PEG. Any thoughts?

Doing the math from the meager specs on their web site, it looks like it puts out around 12ma 5v at a walk. At that rate it would take about 80 hours of walking to charge my Palm TX. Too low to be of much use and it weighs 12oz. I'll pass.

Jeez that is pretty dang worthless! Thanks for crunching the numbers.