1-18-08 (internationally 18.01.08) is the release date of Cloverfield and the name of a website used to promote the film using Viral Marketing.
The website has a number of pictures on it which provide clues as to the monster's origin. The pictures can be turned over to view certain information further regarding the Viral Marketing. The date was used, for a short time, as the film's unofficial title. When the teaser trailer was released, shown before theater viewings of Transformers. The Teaser Trailer gave "1-18-08" instead of an actual title, to provide further mystery as to the film's exact content.