Fast Flag Captures: CTF Colossus:

After grabbing the flag on Colossus, instead of walking all the back with it try running straight forward and tossing it over the wall. A well-timed throw will make the flag bounce off the floor in the center area and all the way to your side of the map, where one of your teammates can easily capture it. It takes some practice to perfect but it can turn the tide in a close game.