ATI announced to have started distributing to a limited number of developers the first pre-release versions of its Open CL drivers. The final version as well as the SDK should arrive later in the year.Of course, Snow Leopard planned to be released in September will required such open CL drivers for both NVidia and ATI/AMD graphic cards. Nevertheless the GPU to be compatible with Open CL is rather small and restricted, and should maybe be considered by customers when planning the purchase of one of the new MacBook/MacBook Pro models.
It will be very interesting to check if Open CL will be able to compete on PC and Windows with the proprietary solution made by Microsoft, the successor of DirectX10b.