http://www.kickstarter.com/projects/690528216/hone-for-iphone-4s-never-lose-your-keys-again
My partner and I lose our keys almost every day, so we decided to do something about it. Hone for iPhone 4S and the new iPad 3 is Bluetooth low energy device for your keychain that lights up and audibly vibrates when triggered so you can find your keys. It runs for six months on an included battery and has a 150+ foot range.
