Young 'uns kept awake by nightmares about Johnny Depp's bob haircut apparently whiled away the hours by plowing through Harry Potter and the Half-Blood Prince, which sold 6.9 million copies in the first 24 hours after its Friday release. (That's 250,000 books sold per hour; I took math.) Reviews of the penultimate Potter proffering were strong, calling it "the darkest and most unsettling installment yet" (The New York Times) and "a powerful, unforgettable setup for the finale" (AP). In Scotland, J.K. Rowling read excerpts to a group of children at Edinburgh's medieval castle then revealed that the final book's title will be Harry Potter and the Author's Obscenely Large Advance Check.