There are already 2,048 x 1,536 reasons to covet the latest iPad, but here's one more: it's the first tablet to incorporate the latest Bluetooth 4.0 "Smart" standard. Like the iPhone 4S, Apple's new slate is ready to pair with other Smart devices that drain far less power than previous modules. Want to complement your purchase with a wireless keyboard whose batteries will last for years? Or to plaster your body with tiny low-power sensors so you can, erm,
