Google Bomb ---- Interesting!!
A Google bomb is an attempt to bias a search result on Google by increasing a Web page's PageRank. PageRank is a numeric value that represents how important Google says a page is on the Web. Pages with high PageRank display early in search results
Eg:-
1) The first Google bomb occurred in 1999. When searched for the "more evil than satan himself." Users searching Google for the term found Microsoft's home page as the first link in the search results.
2)One of the most famous Google bombs occured in 2004, when U.S. President George W. Bush was up for re-election. To experience this particular Google bomb, try searching for "miserable failure" on Google. The first return will be a link to the biography of George W. Bush on the official White House Web site.
MORE INFO:
Googlebomb Watch on Google Blogoscoped keeps tabs on current and past Google bombs.
Danny Sullivan explains why he doesn't find Google bombs very scary in this SearchEngineWatch article.