WinDriver USB for Linux - Device Driver Development Toolkit - WinDriver USB for Linux automates and simplifies the development of user mode Linux device drivers and hardware control applications for USB peripheral devices. No Linux kernel knowledge or kernel level programming required. - http://www.jungo.com/linuxusb.html
Linux Mobile System - A full Linux system whose support is the new USB Flash Memory Drives. - http://linuxmobile.sourceforge.net/
Linux USB Guide at USBMan - Linux USB and USB 2.0 information, drivers, news and links. - http://www.usbman.com/linuxusb.htm
Linux USB Guide - Document, draft of guide to using, developing USB subsystem under Linux. - http://linuxusbguide.sourceforge.net/USB-guide-1.0.9/book1.html
International USB Keymap - Creating a USB xmodmap for X Windows. - http://www.cyberlink.ch/~hochstra/ydl-g3/keymap.html
USBView - A download for Linux users that displays the topography of the attached USB device. - http://www.kroah.com/linux-usb/