accelerometer

The Nike FuelBand won't hit the market for weeks, but the sultan of swoosh already knows it has a hit. The $149 high-tech wristbands sold out quickly during two short-lived online buying opportunities over the weekend. Here's what all the fuss is about.

The cool technology that allows your iPhone or Wii controller to sense how you're moving it is a gyroscopic chip, and as the market for such motion-controlled devices grows, so do the prospects of gyroscopic chip makers like InvenSense, which just announced plans for an IPO.