My favorite version of Hamlet on film is the little snippets you see in between the real action in Tom Stoppard's Rosencrantz and Guildenstern Are Dead. I love the rest of that film even more than the Hamlet bits. That one's got Gary Oldman, Tim Roth, and Richard Dreyfuss, each of whom did an excellent job. Originally a play by Stoppard, the film was directed by him as well.