On Mentorless, there's a great post about Eternal Sunshine's cinematography, featuring a ton of great stills from the film.
Ellen Kuras, an ex-sociology student turned cinematographer while working on a documentary, handled with perfection the multiple moods, from present time to flash backs, to dreams, to nightmares, to erased memories, making them all blend into one coherent story. Needless to say, production designer Dan Leigh and editor Valdis Oskarsdottir (and their teams) are equally key contributors, but Kuras managed to give life to the camera in a rarely seen way so that what we see is what the characters feel, with all the changes and variations that implies. (Source)
The article's two years old, but it's new to me. Thanks to Cristian for the find!