Gone so soon, Kindle? Due to what we can only assume is unprecedented demand or a terrible shortfall in supply, Amazon's third-generation Kindle (you know, the one with 3G and WiFi) is already sold out. Just days after being pushed into the world, the $189 e-reader is now hoisting a "temporarily sold out" sign, with Bezos and Company urging prospective consumers to place their order now in order to "reserve a place in line." So, what'll it be? Reserve now, or throw a temper tantrum? Tough call, we know.