Just before Christmas ATI delivered a nice present for everyone interested in OpenCL development, in the form a full release of their Stream 2.0 SDK, including a whole host of additional goodies. For me the most important additional features are:

• support for the an Installable Client Driver (ICD), which allows for multiple OpenCL implementations to co-exist on the same system
• a stream performance profiler integrated into Visual Studio 2008
• a preview implementation of support for Double Precision in OpenCL C kernels
• a raft of OpenGL, DirectX 10 and CAL interoperability support previews

Find the full details here.