USB 
 [[http://www.linux-usb.org/USB-guide/book1.html|USB HOWTO]]<<BR>>
 [[http://www.linux-usb.org|linux-USB]]<<BR>>
 [[http://linux-hotplug.sourceforge.net|linux-hotplug.sourceforge.net]]<<BR>>
 [[http://usb.org|usb.org]]<<BR>>
 [[http://usb-by-example.com|book ]]<<BR>>
 [[3G USB]] modems and cards

USB driver development

 [[https://marc.info/?l=linux-usb-devel|old linux-usb-devel mailing list]]<<BR>>
 [[https://lore.kernel.org/linux-usb/|current linux-usb mailing list archive]]<<BR>>
 [[http://ftdichip.com|a USB chip]]<<BR>>