Links that may help with controlling the camera

http://sourceforge.net/projects/libptp

http://www.gphoto.org/

http://www.teaser.fr/~hfiguiere/linux/digicam.html

http://capture.sourceforge.net/

http://www.imagemagick.org/Usage/

http://www.wiredfool.com/2006/11/09/tonights-hack/

*some of these might have worked, but the Canon SDK does not support the Elph series that well.  We're taking pictures more invasively by soldering wires to points on the push-button switch that takes pictures