Nvidia is preparing to release their WHQL certified PhysX driver on August 5th for GeForce 8, 9, and GTX series videocards. The new ForceWare driver will expand PhysX support to currently available PhysX titles like Ghost Recon 2: Advanced Warfighter, Warmonger and Cell Factor: Revolution.
WHQL or Windows Hardware Quality Labs is a testing process that when passed allows vendors to use a "Certified for Windows" logo, which certifies that the hardware or software has had testing by Microsoft to ensure compatibility with Windows. Many vendors like being able to hang that logo on their products, so we will see more videocards touting PhysX support and the Windows certified logo hitting big box store shelves soon.
Nvidia acquired PhysX when they bought Ageia. PhysX is now part of CUDA (Compute Unified Device Architecture) that Nvidia developed. CUDA may take off in a big way if some driver modders succeed in getting it to run on Radeon videocards. No word yet if ATI plans to support the project at all.
Yet another reason to upgrade my trusty 7900GT. Is PhysX support enough to make you upgrade your older card?