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No idea what "Barts" is...but I'm going to try mining with it!
"Barts" is the ATI codename for the 6800 chipset. "Cayman" is the 6900 series.
As far as permission denied: yeah either your user doesn't have permissions or the file isn't executable, e.g. "chmod a+x phoenix.py" & cetera.
Hey, the issue was that I had done several of the steps from the howto as root ( as opposed to using sudo ). I chown'd all the poclbm.py and other python files and its working now.
Its pulling 247000 khash/s...which is well over 4 times what the imac is doing....not sure if thats good or not, but I'm going to sleep regardless.