Eternal Sunshine of the Spotless Mind (not sure how underrated it is but I wasn't sure I liked it until after the second time I saw it).
Lost in Translation
Eternal sunshine isn't underrated! People bang on about that like it's the best thing ever! (& for the record, I love it too )
underrated movies.
Guillermo Del Toros work (Pan's Labyrinth, The Devils Backbone, The Orphanage, Hellboy)
Sandler's serious work (Spanglish, Reign On Me, Punch Drunk Love)
The Story of Us
The Big Lebowski
K-Pax
Dan In Real Life
Moonrise Kingdom
The Life of David Gale
Guillermo Del Toros work (Pan's Labyrinth, The Devils Backbone, The Orphanage, Hellboy)
Clerks 2
Rounders
Let me think about this more...
Little Miss Sunshine
Excellent list although I wasn't fond of Spanglish and I think the first Clerks was just as good as the second.
Also:
Dogma
Little Miss Sunshine
That is definitely not underrated. In fact it would go in my OVERRATED movies list!