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If yes, is there any reason why it hasn't still been ported to R600g?
The gallium-msaa branch was just a little cleanup containing a few interface changes. It didn't add MSAA to any driver or state tracker. There is still a lot of work needed in both hardware drivers and the Mesa core. We are basically at the beginning.
The extension ARB_multisample is supported on all drivers, but there are no visuals to make use of it. Some rather experimental and untested support has been written for r300g, but that's far from complete. MSAA is also coming to the nv50 driver.