Scott and I saw Doubt (IMDB.com) yesterday (bypassing the huge lines for Frost/Nixon). Streep and Hoffman were great. At times, Streep's performance seemed more like The Devil Wears A Habit; however, her overzealous, overly suspicious, and overly confident character was even sympathetic.
As a movie, Doubt isn't spectacular. Since the movie was based on a play, much of the movie's most compelling scenes were simple two-person exchanges. I can definitely see how this would have been a great play to see in person.