You can see http://www.superant.com/cgi-bin/slencyclopedia.pl?USB and the same in http://www.wlug.org.nz/USB
Very interesting links like :
*http://linuxkey.biz/ *http://linuxmobile.sourceforge.net/ and * http://linuxdocs.tuxfamily.org/flonix/index.php
Regards.