This video was shown in one of my lectures last week - it's about XML and Web 2.0 - but mostly about the Internet and its evolution. I reckon it's worth a look even if you have no idea what those things are, just because it's rather well-done. Not too long, either.
(of course if you don't know what the Internet is you wouldn't be reading this entry, but I digress.)
http://www.youtube.com/watch?v=6gmP4nk0EOE