!Spoiler warning!
http://laist.com/2008/01/09/laist_interview_88.php LAist interviews Matt Reeves. He provides a full explanation of where the title 'Cloverfield' comes from, his inspirations behind the film and his opinions on internet speculation.
http://www.slashfilm.com/2008/01/09/cloverfield-building-a-better-monster/ Slashfilm exposes some of the production notes from Matt Reeves. Spoilers include: the thought process behind the monster, how it acts and what else New York should be fearing.