Ghost Recon: Advanced Warfighter is one of the most anticipated titles for the PC in some time. Though it has been out on the Xbox 360 for a little while, the PC version is much more advanced in terms of gameplay and image quality as it was developed by a different team internally. Of course, the PC version also has support for the AGEIA PhysX technology; both in software and hardware support.You can check it out over here.
AGEIA PhysX card in action

PC Perspective has a couple of videos of AGEIA's PhysX in action in Ghost Recon and Cell Factor: