This is the coolest thing we've seen in a long time. The Jawbone UP is a piece of jewellery that is also a technological innovation that you didn't know you actually needed. It keeps track of your health, and syncs to your iPhone (just buy one already) and to a website to give you a baseline of where you're at. It monitors your activity and sleep, reminds you with a vibration to eat or get up and stretch, and can present you with programmable physical activity challenges to add some motivation to your exercise regimen. You can learn more here, and there's a great short video after the jump.