Volume Control Knob Turns Heads. It's a volume control for computers, but why is it so hot (and so expensive)? Well, it can do ... so much. Leander Kahney reports from Macworld Tokyo. [Wired News]

"People see it on someone's desk, glowing and pulsing, and they've got to know what it is," he said. "We get people saying, 'It's incredibly useless, I use it every day.'"

It's the power of having a very simple idea, and executing it well.