I remember many years ago, when the web was in it’s infancy, there was a site where you could control a model train set. By clicking a button you could select where you wanted it to go and watch the web-cam as it trundled to it’s destination. The site no longer exists but this kind of interactivity between the Internet and the real world is something that still excites me today.
The reason I mention this is I have found the web site LED Live where you can submit a line of text that is then displayed on LED matrix boards in Seattle, USA. Not quite as fun as a train set, but as you can see from above I had some fun never the less.