I have launched openclreference.com, which is inspired by cppreference.com. My objective is to create community-maintained OpenCL documentation that supplements the official standard. I need help from the community to populate this site with content, so if you have some spare time please consider contributing. I will also mention that the best way to learn OpenCL is to read the standard and contribute to the community documentation.
I personally will try to avoid writing documentation about the function specifications of OpenCL, and attempt to write more advanced pages on topics like OpenCL design patterns, and GPU architecture. Let’s see how far we can get with this new site!