I got the beta for the 2.61 ( 2.60.5 r42132).
When trying to render in Cycles I get:
"OpenCL: C version 1.1 or later required, found 1.0"
That's a problem because there is no official OpenCL 1.1 driver from NVIDIA for OS X Lion.
The previous built I used allowed CUDA support and worked ok.
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It's true that we require OpenCL 1.1, and so we don't support using OpenCL on this configuration. CUDA should still be available as a choice, as long as you have the CUDA toolkit installed. Is this missing in the beta build for you?
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/GPU_Rendering
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CUDA didn't show up as an option on 2.60.5 r42132, but it does on 2.60.1 r41600.
But now that I read your link I can reassure that it does work slower than the CPU because I'm running a GeForce 8800, but shouldn't I still get the option to have CUDA?
I'm pretty sure I have the latest CUDA drivers (4.0.50).
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Renan, I think that had the same problem. Now I use this build to render http://www.graphicall.org/177 There are more CUDA kernels so it works on my 8600GT. But as I got it's not officially supported.
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We require the CUDA toolkit to be installed on Mac now, rather than bundling prebuilt binaries.
http://www.nvidia.com/object/thankyou.html?url=/compute/cuda/4_0/toolkit/cudatoolkit_4.0.17_macos.pkg