James Kruper, President of Kioware, has put up a nice opinion piece on the case for browser-based kiosk applications over at selfservice.org. Normally I wouldn't plug a competitor's perspective too much (it's a bad habit :), but to be honest WireSpring doesn't often compete against Kioware directly, and more importantly, we do take a very browser-based approach to kiosk software, so the more perspectives, the better.
While Kruper focuses on the ability to re-purpose applications and use plug-ins to give kiosks the ability to place Word, Excel, etc. documents into a browser, I think I'd take it one step further: a well designed Internet-based web application should really be just a few style sheets away from being an excellent kiosk application. Usually, if somebody has put the work into making their Internet-based app functional and easy-to-use, it should only be a matter of optimizing the front-end interface to work in a self-service environment. While that might have been tough in 1996, with today's CSS and XHTML standards, a well-formed app should easily be up to the challenge.