ec2-18-207-129-175.compute-1.amazonaws.com | ToothyWiki | Google | RecentChanges | Login | Webcomic The study I saw described: Something like a third of hits from Google were mismatches - the user almost immediately went back to the main Google page. Presumably they thought whatever they were looking for was on that page, it wasn't, so they tried another of the results. Of the rest, about 80% were looking for a specific piece of information, an answer to a question or a file. They followed zero or one links off of the page - when those links promised exactly that information.
Note - that means a lot of hits from google come in via another site - google took the searcher to a site that had the description the searcher wanted, and that site linked you to the decription.
The remainder were searching for the site they ended up at.
Presumably they knew the site, but not the URL. I can support that google has completely overtaken DNS in usefulness for me. It is an interesting question how many of those users you'd lose if you lost google.