Petapath is actively using OpenCL for internal development purposes. "With only a single public Beta of a GPU OpenCL driver available it’s certainly early days for using OpenCL in earnest. Even the OpenCL forum at the Khronos Goup has a limited amount of traffic from users (but people who are working hard on OpenCL are definitely there to help)." says the Petapath website. Petapath is going to start posting comments and experiences they've had with OpenCL. Petapath has also created an OpenCL Twitter Twibe on which they will post interesting news, links and related information. The Khronos Group is also on twitter.