Talk about a super blockbuster, The Dark Knight continues to come in at number one in weekend box office returns ($43.8 million) after its third weekend, but The Mummy: Tomb of the Dragon Emperor came in close at second ($42.4 million). Rounding out the top five are Step Brothers ($16.2 million), Mamma Mia! ($13.1 million) and Journey to the Center of the Earth ($6.9 million). more ›