Brad Pitt, who will next be seen in the July release "The Fight Club" with Edward Norton, has expressed "serious interest" in a thriller called "The Courier," sources have told Variety. The $50 million indie project concerns a courier hired to make a drop to a man who is impossible to find. Pitt has been circling the film for some time and will likely take an executive producer credit if he participates. Shooting will probably take place in a number of locations, including San Francisco, Chicago and Las Vegas.