Good luck finding one! Sure there are other search engines aside from Google, but think about which one is most commonly known through age ranges 12-60? Google, plain and simple. Everyone's website search or DSL homepage search is powered by Google, everybody knows it and it's going to take one tough SE to compete with that
I know, but it still delivers more search results than yahoo. (Of course its powered by Google, but it's not the same engine - it deals with different data). http://www.tgdaily.com/trendwatch-features/39777-youtube-surpasses-yahoo-as-worlds-2-search-engine