ok since everyone is posting their same hitlist of 'good movies' im gonna try and think of some stuff you should see that you might not have heard of, as i consider myself a film connosieur

Falling Down - http://imdb.com/title/tt0106856/
Bullet (Just watched this still in my head) http://imdb.com/title/tt0115781/
Bubba Ho-Tep - http://imdb.com/title/tt0281686/
Bound - http://imdb.com/title/tt0115736/ (little known small budget noir crime film from the creators of the matrix with hot lesbians)
Primer (CRAZY indie movie, Won Grand Jury at sundance 2004 - http://imdb.com/title/tt0390384/