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http://www.linux-usb.org/USB-guide/book1.html
Table of Contents
I. Using the Linux USB sub-system
USB Devices and Transfer Characteristics
Enumeration and Device Descriptors
How to get USB devices working under Linux
USB Human Interface Device (HID) Configuration
PLUSB Prolific USB-Network driver
NetChip 1080-based USB Host-to-Host Link
USB ADMtek Pegasus-based device support
Reading the Linux USB Device Filesystem output
Configuring extra keys on USB keyboards
Communicating with the Handspring Visor
Communicating with the Diamond Rio 500
II. About this Guide