A little video i found last year that playfully tries to explain how the web is evolving, which I think was originally created by students at Kansas University of all places. Its really got a good grip on how hypertext is different from regular text although its explanation of XML (explanation here) takes a couple of views before you get it. The best bit, to my mind, is towards the end when it starts to point out the importance of tags. I would like you to particularly focus on this concept of tags and start to think about how you can tag the online content you create, to both invite people over, and also help construct a web that is genuinely more able to add to the greater common good – Sean