All totals are U.S. box office only. SF and genre-related films in bold.

Title (Dist.)….Reported Weekend Box Office….Engagements…. Cumulative

1. Iron Man (Paramount)….$51,190,629….4,111….$177,825,024

2. What Happens In Vegas (20th Century Fox)….$20,172,474….3,215….$20,172,474

3. Speed Racer (Warner Bros.)….$18,561,337….3,606….$18,561,337

4. Made Of Honor (Sony)….$8,116,323….2,734….$26,791,494

5. Baby Mama (Universal)….$6,225,790….2,627….$40,836,370

6. Forgetting Sarah Marshall (Universal)….$3,837,240….2,376….$50,781,745

7. Harold And Kumar Escape From Guantanamo (Warner Bros.)….$3,106,424….2,264….$30,667,308

8. The Forbidden Kingdom (Lionsgate)….$2,169,323….1,724….$48,530,104

9. Nim’s Island (20th Century Fox)….$1,463,622….1,601….$44,395,857

10. Prom Night (Sony)….$1,012,986….1,465….$42,785,107

Source: Rentrak