Some movies seemed to fly pretty low under the radar last year (at least around where I live)...

Lucky Number Slevin - Josh Hartnett is mistakenly thrown in between a long waging crime boss war between Morgan Freeman and Ben Kingsley

Running Scared - Paul Walker does bottom jobs for the mob and has to get rid of a gun, but the neighbor's kid uses it to try and kill his father. Now Paul Walker has to find the gun and kid before the mod finds about his botched job and the cops find the gun and link it to the murder.

A Scanner Darkly - Set not too far in the future where a new drug has rapidly engulfed society. Undercover officer Keanu Reeves slowly gets pulled further and further into the drug and starts to lose his grasp on reality.