Plug the cable into a usb port, switch the camera on, and slide the mode switch to Playback. Then just su to root and utter:
gphoto2 --camera "Canon Digital IXUS i (PTP mode)" --get-all-files

Make sure you include the double quotes and your photos will transfer in a few seconds. The JPGs will be owned by root, so you'll need to: chown user. *.JPG Wrap that in a script and it's just too easy. My script also uses date +%F and sudo. Happy snapping :)