Movie titles can't be copyrighted from what I understand. So in that case I would assume you would be just fine. Of course, I'm not a lawyer so if you are really that concerned about it just check with one.
Others seem to get away with it just fine though...such as http://www.transformermovie.com/
Trademarks protect product and service names, and company names. When a certain name becomes associated with a certain product or service, trademark rights arise. Some of these rights arise simply from use of the mark. Additional protections arise if you decide to register your trademark. Examples of famous trademarks are Xerox, Apple and IBM. If you are in the computer business, you cannot market your computers as Apple computers unless you have the permission of the company known by that name. Likewise, you cannot set up a hamburger stand across the street from McDonald's and call yourself McDonald's, put up golden arches, or in any way try to pass off your hamburgers as legitimate McDonald's hamburgers, when they are not.
However, titles of individual products like a movie are generally not eligible for trademark protection. Only a series of products from a single source, such as sequels or a television series such as Bonanza, can be protected under trademark law. However, for a one-shot project like a movie, the title would not be protected. The title, however, could possibly be protected under the laws of unfair competition once the title has acquired a secondary meaning. A movie cannot have a secondary meaning with the public before it is released. Thus, after George Lucas had produced and distributed Star Wars, another filmmaker could not distribute a movie called Star Wars II, and trade on the goodwill and name recognition of the original. This would be unfair competition, and would violate various federal and state laws. Whether the use of a name on a product or service violates the trademark rights, or violates various unfair competition laws, may be a difficult call.
Trademark rights are often restricted to a geographical area or type of product. For example, if you operate the Acme Hardware Store in Los Angeles, it would not necessarily prevent someone else from opening an Acme Hardware Store in Brooklyn, a location where you do not do business. Likewise, the fact that you operate a Hardware Store under the mark "Acme" would not prevent someone from setting up the Acme Supermarket because people do not associate hardware and food together. In other words, there is little likelihood of confusion.
Another way to protect titles is with registration with the MPAA. This is protection by contract law, through an arrangement between the MPAA companies and any independent producers who choose to join. It is a contract wherein all parties agree not to infringe each other's titles. There are some limitations because the deal is only binding on those people who choose to sign it. If you wish to contact the MPAA Title Registration Bureau, their number is (818) 995-6600. (source: MarkLitwak.com)