Samuel L. Jackson said in a recent
radio interview that Marvel Studios will develop a 'S.H.I.E.L.D.' film in the future:
The Avengers should start shooting some time next year, and then some time after that there’ll be a big S.H.I.E.L.D. movie.
In the comics S.H.I.E.L.D. (Strategic Hazard Intervention, Espionage Logistics Directorate) is an extra-government intelligence and security organization dedicated to protecting the nations and peoples of Earth from all threats, terrestrial or extraterrestrial.