Denham has a post about the 80/20 rule and the inequality of the power law. Though the thing to take away is the long tail point, what lies in the tail is greater than what lies at the big end, so for online stuff something important is that while it might seem obvious that there are hubs (though it isn’t, why link to Google?) what is less obvious is the scale, and complexity, of the tail. Nga has a simple and useful account of why earlier web sites end up with more links to them than later ones (part of the explanation of preferential attachment). Lucy has a simple and elegant account for networks, centres and scale free networks.