As an FYI to those on the gpgpu list.
The Shamrock repository now exists on git.linaro.org. http://git.linaro.org/gitweb?p=gpgpu/shamrock.git%3Ba=summary
This is a spoon (not a fork) of the Clover project. This is a CPU only open source OpenCL implementation. It is not as of yet complete nor bug free but is under development.
Discussions / questions about the project are most welcome on the list.