Well, there's no mystery here: The cast of Gosford Park, Robert Altman's acclaimed ensemble whodunit, can act. Gosford won the top prize — best cast of a film — at Sunday's eighth annual Screen Actors Guild Awards. Halle Berry was named best actress for Monster's Ball, beating out frontrunner Sissy Spacek, and Russell Crowe took home best actor honors for A Beautiful Mind. (No, he didn't read that darn poem.) Other winners: Sir Ian McKellen (best supporting actor for The Lord of the Rings: The Fellowship of the Ring) and Helen Mirren (best supporting actress for Gosford Park). TV victors included Sex and the City (best comedy series ensemble), Will & Grace's Sean Hayes and Megan Mullally (best actor and actress in a comedy series), The West Wing (best drama series ensemble) and WW's Martin Sheen and Allison Janney (best actor and actress in a drama series).