In the fickle world of cinema, there are very few names you can splash across a billboard to ensure a film's financial success. Harrison Ford, perhaps, or Julia Roberts. George Lucas, if it's a Star Wars movie. Tom Cruise seemed a cert till Eyes Wide Shut. These names will probably make you millions, but there's only one sure-fire guarantee - Steven Spielberg. As a director, he's the most successful of all time. His films have been so popular, so consistently entertaining, that people rush to see anything tagged as A Steven Spielberg Production, even movies he merely financed. No one else has muscle like that. No one else ever has.