I just came across this article, thought you might find this interesting.
http://www.vizworld.com/2010/03/switch-cuda-opencl-easily-swan/?utm_source=rss&utm_medium=rss&utm_campaign=switch-cuda-opencl-easily-swan
Translates CUDA kernel source-code to OpenCL
If this works with Octane....Man that would be sweet!!
Update: Also, check this out: http://www.anandtech.com/show/2977/nvidia-s-geforce-gtx-480-and-gtx-470-6-months-late-was-it-worth-the-wait-/6
Nvidea cards work extremely well for opencl, this means there are only advantages of switching over.
More customers
Swan website: http://www.multiscalelab.org/swan
Radiance, please check this out
Keen to know what everyone thinks, thanks.