Nowadays I am looking on behalf of my master thesis topic as well as an estimated all probably I’ll opt on behalf of ‘Implementation of Real-time Ray Tracing by using BHV Algorithm on NVIDIA CUDA Architecture’. CUDA is a very new technology of NVIDIA on behalf of NVIDIA GeForce 8 series graphics cards. What is different in CUDA is; it allows you to jog C codes on GPU with some exceptions such as no-recursion, however, it enables memory addresses to reach on GPU’s memory as well as provides 16KB very fast common memory area (we can call it cache). This architecture also needs stream processing drivers, however, unfortunately, NVIDIA provided the drivers on behalf of only Linux as well as Windows XP operating systems yet. I hope they provide Vista drivers as soon as possible otherwise I have to buy a desktop computer with NVIDIA 8800 GTX  Hmmmm, thatz not baddddd  
CUDA: Compute Unified Device Architecture
For basic information: Cuda Wiki, Ray Tracing Wiki

For more information: Cuda NVIDIA, Vision, Modeling, as well as Visualization 2005: Proceedings, November 16-18, 2005 … By G. Grenier