J.K. Rowling’s Pottermore.com Web site launches in October, but a tiny segment of Harry Potter fans (just one million) will be granted early access. To select winners, the site is running The Magical Quill challenge. Each day, a clue appears on the site. Those who guess it correctly will be directed to the registration page (if it is still open that day). The contest began on Sunday and runs through this Saturday, August 6.