The Tile App
Keys, wallets, cell phones and purses have a way of wandering off. Tile helps users track and locate up to 10 items at once from a single app. It relies on small squares ($19.95 each) that users attach to a laptop, phone, bike or any other object that seems to disappear. If one of the objects is lost, you can trigger an alert; it can also pinpoint the last place the object was seen on a map. (Bonus: You can share your account with other users, so friends and family can pick up items you may have left behind.) The device is on pre-order until Spring 2014, but for the person who seems to lose everything, it might be worth the wait.
Suggested by Erica R. Hendry