I'm John. I currently own three Pis and am breathlessly awaiting tomorrow's arrival of my new 2.8 inch LCD touchscreen tomorrow. These things should never arrive on a day I have to work the next day. The boss get bothered by snoring at my desk for some reason.
My first project with the Pi was a captive portal-based web site used to sign in people for meetings. I used a Pi running dnsmasq, hostap, apache2, PHP 5, and MySQL. It's a headless server, so the user just plugs it in and waits a few minutes for it to boot up. Then people can just walk into the room, connect to the wifi network and, since it's a captive portal, go to almost any web site and they will be presented with the sign-in system. It is, of course, mobile enabled. For the Luddites, I bring an old laptop to the meetings. Now I don't have to decipher their chicken scratch handwriting
Best of all, it cost a whopping $66- for the hardware
Send me a message if you would like more information on it.