At CES Sony announced the Sony SmartBand, which is a bracelet that keeps track of your activities throughout the day. It is apparently comfortable and wearable in the water. The battery lasts up to five days. You can toggle music using the button on the bracelet, and a companion application called LifeLog lets you look at all of the data being collected by the SmartBand.

The bracelet part is available in many different colours and designs.

Looks rather good.