Contrary to reports  the NSLU2 EXT3? formatted drive CANNOT be mounted directly via USB or Firewire in Mac OS X 10.4.8 (perhaps even earlier versions) using the EXT2FS for Mac driver because the formatting is Journaled EXT3? (approve sites). Hence, as of now, it is not possible to directly mount an NSLU2 formatted EXT3? drive on Mac OS X.