Google as a search engine is easy to use although at times I have noticed some changes. I believe the reason could be to the company's growth spurt but I could be wrong. They are building a data facility in IA .
The most well known search engine on the web, also the most wealthy. It is the best search, but sites in the search aren't filtered and some may be scams or spam. That's why people should use site such as WOT, Stumbleupon, and the siteadviser.