GARY OLDMAN AND DANIEL RADCLIFFE, HARRY POTTER AND THE ORDER OF THE PHOENIX

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2. Harry Potter
the-leaky-cauldron.org
Launch Date July 2000

What You'll Find ''Leaky,'' as it is affectionately known, is a fanatically detailed almanac of all things Potter. In addition to the latest 411, standout features include PotterCast (a podcast showcasing the people who worked on the movies and books), a Chamber of Chat role-playing game, and the ''Ask Peeves'' search engine. Fans can also submit their own essays or post instructions on how to produce various Potter crafts such as a hand-carved wand and a Mirror of Erised mural. (C'mon, you know you need it.)

Why It's Essential Its accuracy and thoroughness have earned Leaky the respect of both J.K. Rowling — who has called it ''my favorite fansite'' and even given it a rare interview — and Warner Bros., which singled it out for an exclusive set visit.

Official Site harrypotter.warnerbros.com
Plenty of basic movie info, but it's the extras — like the virtual Marauder's Map, a book of curses from Mad-Eye Moody's class, and the ability to compete in the Triwizard Tournament — that really cast a spell. — Tina Jordan