At GDC 2006 in San Jose next week Havok will announce Havok FX, a game physics framework for GPUs. There are two talks about Havok FX:

Havok FX: GPU-accelerated Physics for PC Games
Speaker: Andrew Bond (Havok)
This session introduces Havok’s latest innovation for game physics: Havok FX, which enables real-time processing of thousands of rigid-body objects on current and next generation GPUs. Havok’s general approach to GPU Effects Physics will be covered, as well as tool-chain requirements and trade-offs with game-critical, game-play physics processing on the CPU.

Physics Simulation on NVIDIA GPUs
Speakers: Simon Green, Mark Harris (NVIDIA)
Havok FX leverages state of the art software and hardware technology from NVIDIA to extend the capabilities of NVIDIA GPUs and SLI multi-GPU systems to include physics processing for massive real-time effects. In this presentation NVIDIA and Havok engineers will describe how Havok FX utilizes NVIDIA technology to simulate and render thousands of particles and rigid bodies in games. Live real-time demos will demonstrate the high performance available with current GPUs and provide a look into the future of physics processing on NVIDIA GPUs.