I flicked over to the developer's pages on the NVIDIA web site and found Cg toolkit for Linux.
and Cg tutorial examples:
So, it does look like NVIDIA is serious about supporting Liunx developers.
I still, though, from my examination of the rest of the site, the diversity of Windows software available, and the scant mention of Linux, get the impression that Linux developers are an afterthought.
What are your experiences? How does NVIDIA support Linux developers?