General search engines
All the Web
Alta Vista (natural language search)
AskJeeves!
Excite
FastSearch (All the Web)
Google
HotBot
Teoma (beta)
WiseNut
Yahoo!
Directories
Infomine
Internet Public Library
lii.org - Librarian's Index to the Internet
Open Directory
WWW Virtual Library
Help and tools
Evaluation of information sources (from WWW Virtual Library)
Searching the web - search strategies (from UC Berkeley)
Thinking Critically about World Wide Web Resources (from UCLA)
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Meta search engines
Dogpile
Ixquick
KartOO - visual display interface
MetaCrawler
ProFusion
Search.com
Vivisimo
Specialized
FirstGov
Google Groups (Usenet)
Images Search - image search engines
Invisibleweb.com
Northern Light - "special collections"
Science.gov - U.S. government science and technology
Scirus - science
WaybackMachine - web archive
About search engines
Search Engine Showdown
Search Engine Watch
Web Search from About.com
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