Holy mackerel. Did you know you can get free tickets to Hollywood screenings just by reserving them online? Apparently this goes on every year. I'm a little too late in getting tickets to the J. Edgar biopic (Leo's going to be there!), but there's still a chance for Shame, Carnage, Arirang, and plenty more potentially great films.
You just sign up and reserve your tickets here. I do think there's a bigger chance of scoring tickets if you actually wait in line at the theater though.