The Kwikset Kevo Bluetooth-enabled door lock is the kind of tech that reminds us that we're living in the future. With one of these installed in your home, you can get inside just by tapping a finger against the lock. Before you panic, this only works if your phone is in range and on the right side of door (i.e. the outside).
The product first hit the market over a year ago, but it only supported iOS.