The best search engine to be found in is Google. If someone is looking for a product, you want to be in Google if you want to get found. Also i like Google for doing personal research. Bing and Yahoo are far more selective and censor results based on their own criteria.
Some hate it some love it but still for me i believe big G is the best search engine out there. I will agree withmoneymakingmom about Baidu, we will definatelly see it rising soon or later and trying to compete G in a global level.