Wouldn't it be nice if you could see who is at the door just by looking down at your smartphone or tablet? The DoorBot lets you do just that by streaming live audio and video to your mobile device. You can also chat with whomever is at the door — perfect when you're tied up and need to buy a few extra seconds. Crowdfunded by Christie Street (a Kickstarter competitor), the DoorBot can also come in handy when you're at work or on vacation. You could tell the delivery guy to leave that package or tell him when you'll be back. Even though it uses Wi-Fi; four AA batteries should last you a year. Available in July.