In our last article, we looked at some interesting ways to visualize your website structure to illuminate how external links and PageRank flow through it. This time, we’re going to use the same tools, but we’re going to look instead at how a major site structure change might impact your site.
Search engine crawlers can determine which pages on your site are the most important, based, in part, on how your internal links are structured and organized. Pages that have a lot of internal links pointing to them — including links from the site’s navigation — are generally considered to be your most important pages. Though these are not always your highest-ranking pages, high internal PageRank often correlates with better search engine visibility.
via Marketing Land