STUDIO ESTIMATES: 'Ratatouille' only the 6th-best Pixar opening w/$47.2M; 'Die Hard 4' exceeds expectations with $33.1M 3-day and $48.1M 5-day; 'Sicko' strong w/$4.5M, but it's no 'Fahrenheit 9/11'
by Steve Mason
SUNDAY: Pixar has returned to the top of the box office, but their little rat named Remy doesn't have nearly the box office juice of Buzz Lightyear, Nemo, Mr. Incredible or Lightning McQueen.

