I'm looking for a simple-to-use photobooth type system, where the user presses GO (or some such button), a photograph is taken, then immediately printed. Something like Apple's Photobooth, but that prints the picture taken immediately. We have a number of different computers (OSX, windows, or linux) and cameras (mostly Cannon SLRs) at our disposal. Does anyone know of any such software?
I think this is exactly what you're looking for: http://sparkbooth.com/
Spark Booth is an easy to use standalone software.
There is a good document about creating a DIY photo booth including links on how to get a physical button at http://rasterweb.net/raster/2011/05/19/the-photo-booth/?iframe=true&width=80%&height=80%