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/

Alt Search Engines
   Charles Knight maintains a list of the top 100 alternative and niche search engines. Includes news, reviews and debates on search engines.
   http://altsearchengines.com/

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

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

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

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

FTP Search Engines
   Rated links to ftp and mp3 search sites.
   http://www.ftpsearchengines.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

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

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

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/

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

OpenSearch
   A collection of simple formats for the sharing of search results. Includes specifications and frequently asked questions.
   http://www.opensearch.org/

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

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

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

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

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/

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/

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://www.robertlackie.com/invisible/index.html

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