The witching hour is almost here. Thousands of would-be warlocks, sorcerers and ordinary, non-magical Muggles lined up outside bookstores from Sydney to Seattle on Friday, eager to get their hands on "Harry Potter and the Deathly Hallows," the seventh and final volume in the boy wizard's saga. In a now-familiar ritual that is part sales frenzy and part Halloween party, bookstores across Britain were flinging open their doors at a minute past midnight Saturday. Shops as far afield as Singapore and Australia were putting the book on sale at the same time; the United States was to follow from midnight...