Why the long face, Na'Vi? You're setting box office recordsWith a $75 million second weekend for James Cameron's 'Avatar' leading the way, Christmas weekend is on pace to break the all-time three-day weekend record of $268 million set last July when new release 'The Dark Knight' led its pack with an opening weekend gross of $154.4 million all by itself. The new record is an estimated $278 million.

Hot on 'Avatar''s big blue heels is Guy Richie's 'Sherlock Holmes' with a three-day estimate of $65.4 million, and 'Alvin and the Chipmunks: The Squeakuel,' which will fill finish with about $50.2 million over three days and $77.3 million since its jump-start on Wednesday morning.