There is a linux kiosk software called Webconverger (
http://webconverger.org/). It is basically a live linux CD that will boot as a working kiosk, provided some tweeks are made. I think it's open source, and with some modifications (such as the ability to reset the browser every 15 minutes) it could be a great thing for you guys, if you have a linux guy (or girl) who can customize it.
Just thought I'd bring it to your attention.
