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"I occasionally work with clients who need to have Macs set up as kiosks. That means that anyone can walk up and use the Mac to watch a video or access information, but they usually can't update anything on the Mac. Kiosks are especially useful when the user interface consists of a finger touching the screen. In my experience, touch screens are generally expensive and require that you send a Mac off to a vendor for installation.Troll Touch now has user-installable touch screens for the 20\" and 24\" aluminum iMacs called SlipCOVERs. Priced at $699 (20\") and $899 (24\"), the SlipCOVERs come with touch screen drivers and calibration software. The video above shows a touch-enabled iMac in action -- I especially liked watching the demo dude playing Bejeweled using his finger instead of a mouse. Pull off the aluminum stand, lay that SlipCOVER iMac down on its back, and you've got a 24\" iPod touch!"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/06/18/troll-touch-your-imac-screen/>