Labor Day weekend officially signals the close of the Summer box office season, and this year's ended on, as Variety described it [1], "a whimper" as opposed to a bang. Tropic Thunder [2] landed in the top spot for the third weekend in a row, pulling in an estimated $14.3 million over four days. The second spot went to Babylon A.D. [3] which earned an estimated $12 million. The Dark Knight [4] came in at No. 3, surpassing the $500 million mark on Sunday.

Traitor [5] starring Don Cheadle and Guy Pearce opened this weekend and came in fifth place with $10 million, just behind The House Bunny [6], which came in No. 4 with $10.2 million.

Photos courtesy of Paramount Pictures [7]