Rand Fishkin, CEO of SEOmoz takes some time to explain PageRank as it was when it first came about vs how it is today. Admittedly, it’s greatly simplified in this video BUT it’s probably the most easy-to-understand explanation I’ve heard to date and covers the changes in the system well. For those of us watch the PageRank on our homepage and internal pages it we’ve likely witnessed a lot of what he’s taking about.
To candy-coat it even more, Rand covered the explanation as part of his Whiteboard Friday series so you don’t even have to read. Here’s the video:
SEOmoz Whiteboard Friday-Has Pagerank Changed? (visit for the comments) from Scott Willoughby on Vimeo.