Check this film out when it hits the theaters this July. I saw it when it was here for the Full Frame Doc Fest and it looks to have been picked up and being released in association with MTVfilms. Click the pic to see the trailer. Touching in a violent way.
Also I added a link at the bottom of the page to Movie-List which has trailers from "classics" (70's, 80's, 90's) and also independent films, main stream, you name it. Check out their site. I originally found them when looking for a copy of the "Dr. Strangelove" trailer (what a great film) and they had it along with a ton of other great films. I ended up sitting there for 30 min or so just watching trailers.