You can get the latest version of this Guide from http://www.linux-usb.org/.
It is also mirrored at http://linuxkb.cheek.com/pages/usb-howto.
You can get the SGML source by emailing the author, or from http://sourceforge.net/projects/linux-usb/
You can get a Japanese translation of this Guide at http://www.kyoto.vasara.co.jp/usb/.
You can get a Korean translation of this Guide at http://kldp.org/HOWTO/html/USB/USB-HOWTO.html
Translation into French is in progress.
Translation may differ from this version.