The official website for Cloverfield is CloverfieldMovie.com. Here is the site's description as provided by Yahoo:
Official site of the movie Cloverfield, the monster movie from producer J.J. Abrams and directed by Matt Reeves, in which the entire film is seen as the point of view from eye witnesses of the monstrous attacks on New York City.Paramount has released an official plot synopsis, which according to ShockTillYouDrop.com reads:
Five young New Yorkers throw their friend a going-away party the night that a monster the size of a skyscraper descends upon the city. Told from the point of view of their video camera, the film is a document of their attempt to survive the most surreal, horrifying event of their lives.
UPDATE: An "About The Film" link has been added, with the following description: