USB Digital Camera HOW-TO
site: http://www.linux.com/howtos/USB-Digital-Camera-HOWTO/index.shtml
Extensive guide by Dave Kelly - USB Digital Camera HOWTO

The Linux USB sub-system(
site: http://www.linux-usb.org/USB-guide/c122.html
How to get USB devices working under Linux

Quick way to mount a USB camera under linux by Ryan Forrester www.d9x.net
bash$ /sbin/modprobe usb-storage
bash$ mkdir /media /media/camera
bash$ mount -t vfat /dev/sda1 /media/camera
bash$ ls /media/camera