The Biggest Loser: BodyBugg

SPOTTED: The BodyBugg, a little device strapped on the arms of "The Biggest Loser" contestants.

WHAT CAUGHT OUR EYE: Sure, you can lose weight without it, but this gadget allows you to keep track of calories burned while roller-blading or running errands. It's all done via sensors that track motion, heat, skin conductivity, and skin temperature. Cool, huh? Now if only it could keep us from eating that chocolate donut.

GET IT: At BodyBugg.com. The complete program costs $399 and includes the armband, two phone sessions with a BodyBugg coach and a three-month subscription to a web-based program that includes meal plans, online food logging and target calories burned and consumed.