Someone at work went to see Harry Potter in 3D last night. His advice this mornig was "don't waste your money".
This film was shot in 2D, and 3D effects were all added in post-production. Friends went to see it in 3D and said only 2-3 scenes had any 'real' 3D use. If I see it in a theater, I'll go to a nearby 2D screen.