Comment on MacPython

This should really be updated to point to http://www.python.org/, that's the official download home for the mac version of python. 2.5 also brings a much nicer icon (see http://www.python.org/community/logos/ for the new logo). Alternatively this could be pointed to http://pythonmac.org/ which has other info, but isn't usually as up to date as python.org which carries the official mac python build now.