Google
Search everything, fast and accurate

Lycos
Some subject directories

Excite
Offers a variety of services

Librarian's Index to the Internet
Organized by subject

Digital Librarian
Organized by topic and subject

Yahoo
Commercial listings and organized by subject and offers other services: search, email, classified etc

WebCrawler
Search, white pages, yellow pages

Library of Congress: American Memory
Congressional research, History, and American culture

Archive.org
Movies and multimedia

MetaCrawler
Seaches Google · Yahoo! Ask Jeeves About LookSmart Overture

Dogpile
Seaches Google Yahoo! Ask Jeeves