HEAR THIS: 2011 will be the year of Bluetooth. Or rather the other year of Bluetooth, the first one being, like, 1995. Anyway, here's why you should care about the 'Tooth again: It's called BLE. It's like Bluetooth Light.
Casio isn't the first company to try to connect a watch to a smartphone, but I've got high hopes about the prototype they're showing off this year. Its new Bluetooth Low Energy system promises a battery life of two years.