Google http://www.google.com
Yahoo Search http://www.search.yahoo.com
AltaVista http://altavista.com
Bing http://www.bing.com
For more information on search engine recommendations... http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/SearchEngines.html
Kathy Schrock's Critical Evaluation Survey - Web evaluation checklists http://school.discovery.com/schrockguide/eval.html
What Makes a Search Engine Good?