www.dogpile.com
This site allows you to search Google, Yahoo, MSN and Ask Jeeves all at once! 

www.google.com
This is one amazing search engine – boasting 8 million linked web pages and documents!  This is widely considered the search engine of choice.

www.hotbot.com
This site allows you to choose which engine you want to search from amongst a list of engines.

www.yahoo.com
This is the oldest search engine on the web.

www.altavista.com

This site is good for searching for websites, in addition to audio and video clips.

www.webcrawler.com

This site allows you to limit your search by various fields.

www.mwsearch.com

This site searches through various sites dealing with medical issues.

http://sunsite.berkeley.edu/InternetIndex

This is the Librarians Internet Index.  This site helps you to locate sites that are specific to your research.  Sites are grouped by topics and subtopics.

www.backflip.com

This site follows what you do on the web and creates a personalized web browsing experience.  It records pages regularly visited and allows you to create a daily routine.

http://turbo10.com

Search the "deep web" with this metasearch engine. 

www.completeplanet.com

Find over 70,000+ searchable databases and search engines.