I have question regarding SDKs to utilize GPUs if anyone is has used that technology yet:
Is there any good libraries to utilize Graphics card to do some calculations with both Nvidia and ATI cards? I tried ATI's OpenCL implementation with my HD 4850 and was wondering is it possible get same code working with Nvidia cards?
In fact your OpenCL code should also work on NVidia directly. If there are some issues it is due to differences in OpenCL implementation on NVidia and AMD. I've been mostly working with AMD gpus (even with some OpenCL) and I didn't have any difficulties running applications on NVidia gpus.
Although you need to test it and if it won't work, it should be just some little issues (this is a bit similar to little issues in GLSL under AMD and under NVidia).