NVIDIA uploaded a clip that shows off the PhysX features in Mafia II:
Mafia II by 2K Games is the epic saga in which you can experience immersive, realistic environments, courtesy of NVIDIA PhysX technology. Explosions are more dramatic, debris is persistent within the game, and clothing moves naturally and reacts to environmental effects. Check out how your game experience is greatly improved with PhysX and how NVIDIA GeForce owners have the best platform for experiencing this Mobster mayhem on the PC. Hint: Be sure and watch to the end to see how you can $ave on an NVIDIA graphics card at NewEgg.com (available for North America customers only).