Touch screen kiosks
Using a Mac mini with a Large screen HDTV is a great solution for kiosks. The new Mac mini is easy to connect to an HDTV using the new built-in HDMI port. And with products from NextWindow, you can easily turn most large plasma or LCD into an interactive touch screen.
It is also possible to rotate the screen 90 degrees and eCrisper will adjust to the new screen orientation.
Combined with kiosk software such as eCrisper, you can give your customers access to your website on a large screen. This should work well for museums, art galleries, or any public access information terminals.
Although eCrisper was not designed specifically for digital signage, it might be a great option to be able to display up to 5 web pages on one screen.
As for securing the Mac mini, one option can be seen at http://www.tryten.com/Apple-Mac-Security-Locks/Mac-Mini-Enclosure .