I find this so utterly naive that I am incredulous.
Google is a business. They don't tweek results based in favor of user preferences.
They tweek results based on the amount of revenue they are likely to bring in.
It's not an accident that [in the US] http://www.google.com/search?q=weather provides top links to commercial advertizing driven sites for one's local weather and only portals into the main page of weather.gov rather than the local forecast page.
Google search results aren't the best possible for the most people. They are the worst tolerable for maximizing revenue.
[edit] do employees have to use 20% time for downvoting on HN or is it part of their job?