I saw an even kewler visualization a couple years ago (alas, I can't recall the link). It generated a little "Sim" city type animation of website traffic, with the major pages being tall buildings, and the number of visitors represented as pedestrians, taxis, or buses, visiting each page/building. Not sure just how useful it was, but it was serious eye candy. (sure wish I could find that URL...). And it was all animated so you could see the traffic flow as visitors moved from one page to the next.

Update:
Found it! Visitorville