These might be a few: - Though it's not much more difficult, it does show you spent a little more effort on the website to not just leave the pk there. I would

These might be a few: - Though it's not much more difficult, it does show you spent a little more effort on the website to not just leave the pk there. I would think this would be more relevant for sites not using a framework like wordpress (which we absolutely know from search results filters that google can categorize sites in this way...) - Legacy... older websites that are pure static pages will likely have good keywords in the file name, since it would be maintained primarily by humans looking at directories of files. - Social significance. The link would be more likely to have a better social impact because the content of the page could be determined whether its an anchor tag, posted in irc, or sent in gmail. You might argue that just because the page name has the keywords doesnt mean the content is about that, but I would argue google can quickly detect and demote those kind of things (aka the page title is only really relevant to your seo if it's also relevant to the content... otherwise it's essentially just a random primary key). Just my thoughts...