AIBO, Sony's robotic dog that can cock its head quizzically and roll over on command, was first introduced to the world in a blitz of publicity in 1999. Despite its initial popularity, AIBO got the boot in 2006: at about $2,000 a pop, the robotic dog just couldn't compete with its flesh-and-blood counterpart and never managed to make it to the mass market. Better luck next time, Sony.