With its discounts of as much as 50% and free shipping to anywhere in the world, the Book Depository has been the only large online retailer willing to go toe-to-toe with Amazon.com. What’s more, they’ve managed to remain on friendly terms with publishers while doing so. Now, there’s another reason to visit their site: the Book Depository Live. Yes, it’s a map of the world showing you, in live time, the location of each new purchaser of a book on the site. Warning: it’s addictive.