Like the original author says, finding information on how to get (or ‘burn’) an ISO file onto a USB stick on the Mac is a lot harder than it seems. Here are the basic steps (culled from the excellent and exhaustive instructions here):

  1. Use Disk Utility to wipe the USB disk — a single partition formatted as free space.
  2. Convert the ISO file to IMG with hdiutil convert -format UDRW -o some_filename.img some_filename.iso
  3. Identify your USB with diskutil list
  4. Replace /dev/diskX with /dev/rdiskX and finish the job with dd if=./some_filename.img.dmg of=/dev/rdisk1 bs=1m