One administration after George Bush became the top result for a Google search for "miserable failure," new President Barack Obama has his own such fictitiously engineered result for the query "cheerful achievement".
Earlier Thursday morning, a search for the comparatively unusual term returned Obama's whitehouse.gov site as the top link, the result of a bit of work called a Googlebomb . However, perhaps illustrating the frailty of this particular effort, the result had been bumped to second place behind news of the Obama Googlebomb published the Google Blogoscoped blog. See the more recent view in the screenshot below.
Google uses an algorithm called PageRank to help choose what sites get top rankings in search results; a site's PageRank score is higher when many other sites link to it. A Googlebomb can exploit this algorithm when many people create Web pages and congenial links.