Shawn Blanc reviewed the Jawbone UP, and he’s generally positive about it.
If you’re not familiar, the Jawbone UP is a little device that slips on your wrist like a wristband. It keeps track of your movement throughout the day, reminds you to get up and move around if you’ve been inactive for too long, tracks how well you slept, and will wake you up in the morning when you’re in a lighter sleep.
It’s a neat idea—especially tracking your daily activity and waking you up in the morning—but it doesn’t sound like it’s quite there yet. I think what it points to, though, is a future where we have a number of devices that look more like clothing items, do relatively mundane tasks for us, and communicate with other devices.