Since you're looking for newer stuff...
If you're looking for an overall movie to show off great sound (both subtle and direct), get The Orphanage.
All of the Pixar Blu-Rays are great demonstrations. My favorite might be the beginning of Ratatouille and the chase scene away from the old lady's house. You're getting great rain and weather effects, breaking glass, dialogue, shotgun blasts and it's a good total package scene.
3:10 to Yuma is really good as a 7.1 showcase, and there's a shootout near the end that has impeccable audio.
The Blu-Ray for Forbidden Kingdom sounds great. The movie's a little cheesy and has a lot of the typical child-saves-the-world mumbo jumbo, but the big fight scenes are great HT showcases too.
