• plop.at will allow these older computers to boot into USB, even though the BIOS doesn't support it
• unetbootin will set up my USB drive to install Xubuntu
  • unetbootin doesn't necessarily support xubuntu by default, but you can use the .iso just fine
• alternately, use isotostick.sh
• alternately, you can boot the kernel from a CD, have Linux do the USB-driver-loading, and have it look for the rest of its files on the USB