Tarantino has always been very good about stuffing his films with references and he has not disappointed with Basterds. Just to name a few: The Good, the Bad and the Ugly, The Searchers, Raiders of the Lost Ark, & Miller's Crossing
For the list of every movie referenced in Quentin Tarantino's Inglourious Basterds click here
For the list of every movie referenced in Quentin Tarantino's Inglourious Basterds click here