UDev urls 

http://www.kernel.org/pub/linux/utils/kernel/hotplug/udev.html

FAQ
http://www.kernel.org/pub/linux/utils/kernel/hotplug/udev-FAQ

A general udev primer
http://webpages.charter.net/decibelshelp/LinuxHelp_UDEVPrimer.html

Most helpful urls 

UDEV Primer 

http://webpages.charter.net/decibelshelp/LinuxHelp_UDEVPrimer.html

  1. What is UDEV?
  2. Steps to Setting Up UDEV.

    1. Kernel configuration.

      • Kernel-2.6.13 and greater configuration.
      • Pre 2.6.13 Kernel configuration.
    2. Emerge Udev.
    3. Setup Hotplug.
    4. Sys folder.
    5. Fstab mounting.
    6. Update baselayout.
    7. Edit the scripts.

      • Newer Baselayout ( >=1.11.13-r1 ).
      • Baselayout ( >=1.8.6.13-r1 <=1.11.13-r1).
      • Old Baselayout ( <1.8.6.13-r1 )
    8. Console & Null devices.
    9. Nvidia drivers.
    10. Bootloader.
    11. Rebooting Results.
  3. Problem Devices.
  4. Snippet of How to Write UDEV Rules.
  5. Misc Devices: Palm Pilots, Flash Drive (Thumb, Pen,..)
  6. Links