Google: The pre-eminent web search engine with many databases and services.
Librarians' Index to the Internet: A well organized point of access for reliable, trustworthy, librarian-selected Internet resources.
Bing: The Microsoft search engine that uses its own unique databases.
Ask.com: Formerly Ask Jeeves, this web search engine allows for a question and answer search option.
Gigablast: Has an index of approximately 10 billion web pages and provides keywords related to user-provided search terms at the top of the results page for easier searching.
Yahoo!: One of the first and easiest to use; it has connections to other major engines.
