At the end of the Cloverfield trailer, there is a date of 1-18-08. If you add a .com to that - 1-18-08.com, it takes you to a strange website that has
UPDATE: the link above is to our mirror of the original 1-18-08 site. DO NOT go to the original 1-18-08 website anymore. The domain expired and is no longer controlled by Paramount, and someone else snatched it up to run ads with malware.