"Peter and Bobby Farrelly haven't quite settled on the cast for The Three Stooges, but the funny filmmakers are making progress. In town this week to see Paul McCartney play at Fenway, Peter Farrelly told us that Paul Giamatti has signed on to replace Sean Penn as Larry. (Penn dropped out, citing "personal reasons.") Giamatti, who was note-perfect as Harvey Pekar in "American Splendor," was nominated for an Oscar for his role in "Cinderella Man" and won raves as "John Adams." Playing Moe will be Benicio Del Toro, one Hollywood's biggest "Three Stooges" fans. Still to be cast is Curly. There had been reports that Jim Carrey would utter Curly's signature "n'yuk, n'yuk, n'yuk,'' but it's not so. If Farrelly has someone in mind, he didn't tell us who."