Messing about with iShowU over breakfast (which is why you hear my son asking for yogurt in the background), I came across this visualisation engine for a website as web graph. Very cool tool, but what's even nicer is the way you can watch it evolve. StephenKinsella.net has over 1000 posts over 3 years with loads of uploaded content in the form of handouts and such, so it's a pretty big graph.