Cloverfield now has a mobile phone website (WAP) for the movie, in addition to the Slusho! WAP found a few days ago.
There's information on the Widget contest, a movie summary, theater showtimes (coming Jan 13th), and you can download Cloverfield wallpaper and clip from the movie.
I was not able to download the movie, so let me know if it is different from what we have already seen.
* Thank to CameronJr9 from unFiction for finding this!