Age of Dot Com

Links to search resources including start pages, integrated search forms, portals, engines, guides, and directories. Offers both a simple links page and a directory with descriptions and ratings.
http://www.ageof.com/

Aleph Search

A directory of directories. Links to selected information rich web resources, both unspecialised and specialised, with a strong emphasis on United Kingdom based sites.
http://www.alephsearch.co.uk/

Beaucoup

A directory listing thousands of search services includes engines, directories, and indices, with descriptions and metasearch tool powered by Findtarget.
http://www.beaucoup.com/

Big Search Engine Index

Directory listing hundreds of search engines, categorized, described and rated.
http://www.search-engine-index.co.uk/

Search Tools for Web Sites and Intranets

Provides information, news and advice about web site searching technology. Includes a guide, search tools list, glossary, and opportunity to compare searches of its own site by different tools. Offers a free monthly email newsletter.
http://www.searchtools.com/

Search Engine Watch

Danny Sullivan's comprehensive coverage of the search engine world. Forums, reviews, articles, ratings, and frequent newsletters. Paying members receive access to extra content.
http://searchenginewatch.com/

Geniusfind

Categorizes thousands of the most useful topic-specific directories and databases, with descriptions.
http://www.geniusfind.com/

Direct Search

Gary Price's compilation of links to the search interfaces of resources that contain data not easily or entirely searchable/accessible from general search tools.
http://www.freepint.com/gary/direct.htm

Searchenginez

Search forms for the most effective engines in dozens of categories from Robert Skelton. Includes reviews, ratings, webmaster tools, and tutorials.
http://searchenginez.com/

FinderSeeker

Find the search engine you want by selecting a thematical category and/or country, or search by keyword.
http://www.finderseeker.com/

Search Ability

A guide to directories of specialized search engines. Each directory is reviewed and classified in some detail.
http://www.searchability.com/

Fetchfido

A graphical interface of links to search engines. Multi-layered, with universal, United Kingdom, United States, European and worldwide sections.
http://homepage.ntlworld.com/fetchfido2/interface/search_engines_universal.htm

ISEDB

A directory of search engines and directories worldwide, organized by geographical area and subject, includes articles on site submission, marketing, and optimization.
http://www.isedb.com/

Pandia Powersearch

List of search engines and directories. Also includes a metasearch engine, search tutorial, and a free newsletter.
http://www.pandia.com/powersearch/

Search Engines Worldwide

Search engines sorted by geographical location.
http://home.inter.net/takakuwa/search/

Search Engine Relationship Chart

Bruce Clay's pictoral view of how search engines provide data to partner engines and directories. Requires Acrobat Reader.
http://www.bruceclay.com/searchenginechart.pdf

Complete Planet

Directory of databases and specialty search engines from Bright Planet.
http://www.completeplanet.com/

Search Engine Colossus

Directory of hundreds of search engines, organised by country and topic.
http://www.searchenginecolossus.com/

Search Engine Showdown

A user's guide to Web searching with features, comparative analysis, strategies, discussion, news and reviews.
http://www.searchengineshowdown.com/

The Ultimate Search Engine Links Page

A directory of search engines: general, metasearch, pay-per-click, children's, subject, country and people search. All are described and can be rated.
http://www.searchenginelinks.co.uk/

Those Dark Hiding Places: The Invisible Web Revealed

Librarian Robert J. Lackie provides annotated links to directories, searchable sites, databases, and search engines useful for uncovering content that the general search engines fail to disclose.
http://library.rider.edu/scholarly/rlackie/Invisible/Inv_Web.html

Topix: Search Engines News

News on the search engine industry continually updated from thousands of sources around the Net.
http://www.topix.net/business/search-engines

FTP Search Engines

Rated links to ftp and mp3 search sites.
http://members.cox.net/ftpsearch/ftp1.html

Indexing the Internet

An essay by John Hubbard analyzing the question of what is the best way to index the Internet, with references.
http://www.tk421.net/essays/babel.html

Search Engine Watch

Danny Sullivan's comprehensive coverage of the search engine world. Includes submission tips, better use of search engines, reviews, and articles.
http://searchenginewatch.com/sew.xml

CyberTimes Navigator

The starting point that New York Times reporters and editors use for their explorations of the Web. A straightforward list of some of the best sources on the Web for all types of information.
http://tech.nytimes.com/top/news/technology/cybertimesnavigator/index.html