All totals are U.S. box office only. SF and genre-related films are in bold.
Title (Dist)….Reported Weekend B.O…..# of Engagements….Cumulative
1. Tropic Thunder (Dreamworks/Paramount)….$25,812,796….3319….$36,845,588
2. The Dark Knight (Warner Bros.)….$16,379,293….3590….$471,082,150
3. Star Wars: The Clone Wars (Warner Bros.)….$14,611,273….3452….$14,611,273
4. Mirrors (20th Century Fox)….$11,161,074….2664….$11,161,074
5. Pineapple Express (Sony)….$9,808,295….3072….$62,740,789
6. The Mummy: Tomb Of The Dragon Emperor (Universal)….$8,205,720….3363….$86,245,775
7. Mamma Mia! (Universal)….$6,096,250….2771….$116,013,715
8. Sisterhood Of The Traveling Pants 2 (Warner Bros.)….$5,785,250….2714….$32,002,712
9. Step Brothers (Sony)….$4,807,904….2648….$90,695,938
10. Vicky Cristina Barcelona (MGM)….$3,755,575….692….$3,755,575
Data from Rentrak
