The pitch: Use your phone to unlock your door and don't worry about buying that expensive new security system.

The goods: A simple, minimalist cover goes over your deadbolt-style lock. Walk up to the door with a newer iPhone or NFC-ready device, and the Lockitron physically flips the lock open. That's handy when your arm is full of groceries. You can let in friends and family, too, by giving them one-time codes they text to a special number to unlock.

The result: Initially rejected by Kickstarter on "no home improvement goods" grounds, Lockitron's team crafted its own boutique crowdfunding platform and received 4,704 pledges for $2,278,891 in devices. [$179; lockitron.com]