Version 0.122 is up at:

http://mameosx.sourceforge.net/

Changes are:
  • Upgrade to 0.122 baseline.
  • Fix bug on Leopard where default log level is "Debug".
  • Send Info and Debug log messages to a file in ~/Library/Logs/net.mame.mameosx/
  • Log file is rotated on every launch.
  • Fix log window's resizing (#1856565)

-Dave