Here are some pictures of Cloverfield billboards in Times Square.
I think Konamouse from Unfiction said it best: "Makes me wonder if the budget for advertising and distribution is bigger than the filming budget."
In addition the the billboards, and the New Year's Rockin' Eve special, Cloverfield has been busy sponsoring a variety of TV shows on Comedy Central, Discovery, and SciFi.
UPDATE: They were apparently handing out Cloverfield cups and postcards at the Rose Bowl! Too bad there was no Cloverfield rose parade float!
* Thanks to JookNy21 for the images, Aeon for emailing me about the TV shows, and Marco for emailing me about the rosebowl!