If you need more evidence – other than me telling you! –  that you need more than Google then take a look at The Disruptive Searcher (Sanity checking Google http://disruptivesearcher.wordpress.com/2012/02/27/sanity-checking-google/):

“if I hadn’t searched across more than Google for data on a small, new company that I was asked to research recently, I would have missed out on some very significant information that Google just wasn’t showing me.”

So take a look at Bing (http://www.bing.com/), DuckDuckGo(http://duckduckgo.com/) and Blekko (http://blekko.com/) for starters. The Disruptive Searcher also mentions Dogpile (http://www.dogpile.com/), which combines results from Google, Bing and Yahoo.