Dennis at Cloverfield Clues has posted an analysis of the audio from the 1-18-08/Cloverfield trailer. He also has separated the 5.1 surround sound audio, and posted MP3s.
After listening to the MP3s this morning, there's nothing really out of the ordinary to note. There are a few small snippets of dialogue that were highlighted that you couldn't hear in the final mix of the trailer.
Dennis has created a BitTorrent file with all the seperate audio tracks. You can get that here.