<p>I know that there are a lot of CUDA language bindings, such as PyCUDA, but are there any <em>good</em> bindings for .Net? The only one I've seen is <a href="http://www.gass-ltd.co.il/en/products/cuda.net/" rel="noreferrer">this one</a>, but I'd like to know if there are any others.</p>

Here's another library:
http://sourceforge.net/projects/brahma-fx/
Edit
: I've been looking at the documentation for the project you initially listed, and can say that the interface makes me think: what is the point of using .Net.  The project I've listed has a cleaner interface but no documentation.  The project you listed seems to be more dedicated in the development path ( a recent 2.1 release), but the SVN of Brahma isn't too old (5 wks).
Another poster listed the Accelerator framework.  It looks
very
promising, although its license is non-commercial (you must contact them if you intend to use it for any commercial work), and when I installed it, it said it installed right and I can't find it on my system (this could have been a Vista issue)!
EDIT
: I have looked into the various libraries, and can say here is my "recommendations":
If you are planning on using LINQ and only .Net 3.5, use Brahma.
If you are non-commercial in your goal, use the Accelerator project that the other poster gave (Tim, I believe).  It is higher level than the project you mentioned.
If you don't care about low-level details, but very active project and documentation is desired then go with the project you listed.