Deja Vu: still good, even though we've seen it before

This reminded me of a huge pile of other time-travel movies, mostly Donnie Darko. And it made my brain fry up as I tried to work out the logistics of time travel, and how come he didn't meet himself in the future after he went back, and whether the first reality now ceased to exist now that he has gone back to alter it, and whether at the end he really knew that another version of himself had time-travelled and he was laughing about it, seeing as technically he had no way of knowing that in the future he would come back to this moment, or whether he had some kind of twin-like mystical understanding with his future self in another dimension. Totally wigged me out.
However, good fun. Not his best effort (I still nominate Man on Fire: screw you to the Academy...) and whoever she was, she was reasonable. Unmemorable, though. Notable for the footage of destroyed areas of New Orleans, including a house that was left twisted and skewed across a road, yet with people still living in it. An interesting take on American patriotism in their (and our?) current climate of political distrust, fear, and almost-total reliance on the government.