Have a look here:
http://www.reactivated.net/udevrules.php

all that helped me write this:

je_fro@speedy je_fro $ cat /etc/udev/rules.d/10-udev.rules
BUS="usb", SYSFS{manufacturer}="OmniVision Technologies, Inc.", NAME="%k", SYMLINK="video0"
BUS="ide", KERNEL="hdd", NAME="%k", SYMLINK="dvd"
BUS="usb", SYSFS{manufacturer}="Sony DSC", KERNEL="sd?1", NAME="%k", SYMLINK="camera"
BUS="usb", SYSFS{manufacturer}="Handspring Inc", NAME="tts/USB1" SYMLINK="pilot"
KERNEL="sr0", SYMLINK="dvdburner"
#BUS="usb", SYSFS{manufacturer}="OmniVision Technologies, Inc.", NAME="%k", SYMLINK="video0"
BUS="usb", SYSFS{manufacturer}="OmniVision Technologies, Inc.", SYMLINK="video0"