My buddy SaskView from Canada made a really cool video involving laser triggered high speed photography. You can check out this url for more detail.
He put together a little synopsis of what he did below.
"I've been playing with something called Canon Hack development Kit (CHDK) that replaces the firmware on numerous Canon cameras. It allows you to override the normal functions and to even run programs on the camera. Stuff that you normally can't do on an inexpensive, point-and-shoot camera. Using CHDK and a simple circuit that senses when a laser beam has been interrupted, I can take high-speed photo's like those milk drops made famous by Harold Edgerton."