I ordered this jewel today...
It tracks your steps, distance, and calories burned – and syncs those stats to your computer and smartphones. Nifty, huh?
I have a Polar FT60 heart rate monitor that I love. But, the drawback with the HRM's is the fact that they only track workouts. They aren't meant to be worn all day. Zip will track all day (although, it probably is not as accurate as the HRM, it'll be nice to see how many steps/distance I've taken each day.
After I've used it a while, I'll give a review here.