Kevin Kelly, author of New Rules for the New Economy (and Out of Control) mentioned Amazon Hacks briefly on his Cool Tools weblog: "I picked up this tip from the fabulous book Amazon Hacks, which I feel any serious user of Amazon should read." The tip he was talking about is Hack #46, Track the Ranks of Books Over Time, which walks you through setting up a list of items to track at the great service JungleScan. [heads up via Jason]