I saw it last night as well (after a couple of near misses over the past couple weeks). I really enjoyed it. Norton was great, as per usual, and I thought it was a great role for Giamatti. Biel was also surprisingly decent.
Spoilers:
I thought the end was a little much, a little too Usual Suspects-esque. I did like the film a great deal, though.
But when did New Hampshire become--Such a backward wasteland of seatbelt hating crazies?...I mean, only 40 people actually live there. The others are just visitors who come for the tax-free liquor and three inches of novelty coastline. John Hodgeman on The Daily Show (1-30-07)