Green Guestbook recommends the Pixelink from Canvys Electronics as seen on this page. It is a commercial grade touch screen rated to last for five years with heavy use. GGb will run, however on any touchscreen of your site’s choosing. Further details about the Pixelink can be found in downloadable pdf form in the Details section.

A computer system capable of running Windows XP or newer which can be attached (without public access) to a touchscreen. A 15" - 19" touchscreen monitor should be provided with no keyboard, roller ball or mouse
attached. GGb runs live on the
internet. An All-in-One touchscreen is highly recommended. It will require either an Ethernet adapter or a wireless adapter (802.11g or faster preferred).