If you love all things Atari, like me, you'll have to shell out the $69.99 for this awesome doormat. It's imported from France and features a glowing display and motion sensor. When a visitor comes near, a glowing green space invader moves back and forth across the top of the mat. Just technological enough to scare away those Jehovah's Witness' and cool enough that it should get you more company.
Now all you need is a doorbell with matching sound.