“Appcessories” like this one were big at this years CES. Things like Nike Fuelband- that function as a physical item linked to a smartphone app, or even integrated throughout the phone platform- will be huge in coming years..
Turning physical fitness into a game with a universal scoring
Twine is a kickstarter project making a “puck filled with sensors” that detects anything from moisture to magnetism to connect things to the internet. It’ll tweet/text you status updates based on commands. No coding skills required.