Nike have come to kill off the Jawbone UP, which you may of heard failed badly. It was ridden with bad reviews and many of the devices failed - it got so bad that Jawbone was willing to give full refunds to anyone and they could still keep the damn thing.
Nike+ Fuelband ($150) is here to pick up where the Jawbone UP left. It tracks your activity through a sport-tested accelerometer and translates the information into NikeFuel - Nike's own currency which supposedly measures physical activity. You can set up goals, progressing each day, making the goals tougher and tougher. You can also challenge yourself, reach new milestones and unlock special achievements.
It has 2 sets of LED's. One set on the top which has 100 dots and can show information such as points earned, calories burned and steps taken. The other set which is on the ridge of the band has 20 dots which show performance, going from red to green.
You can also hook up the band to your iPhone and track progress in-depth. Making the experience a lot more interactive.