Hmmmm.. it sounds familiar...

Is it the film where emotion is outlawed, and there are police who hunt down people who have been feeling emotions, but then one of the cops (the guy from American Psycho) starts feeling them himself and ends fighting a load of people?

Edit: Thanks to imdb i've found it, and yeah it's the one I thought. Pretty cool movie, though not overly impressive.

LOL, I like one of the user reviews on the imdb page for Equilibrium. "It was good." Haha!