Does any one know if there is any support for C# or if there is at least a wrapper library for C#
I found a wrapper library for CUDA but none for ATI Stream.
Isn't ATI Stream using OpenCL? If so, you can just put the query "OpenCL C#" into your search engine of choice!
The OpenToolkit (www.opentk.com) supports OpenCL for .NET beside some other technologies for example.