Pandia Powersearch - List of search engines and directories. Also includes a metasearch engine, search tutorial, and a free newsletter.
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.
About Web Search - Jennifer Laycock's guide to search and search engine optimization, with a directory of search tools, news, articles, reviews, and glossary.
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.
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.
Beaucoup - A directory listing thousands of search services includes engines, directories, and indices, with descriptions and metasearch tool powered by Findtarget.
Geniusfind - Categorizes thousands of the most useful topic-specific directories and databases, with descriptions.
Indexing the Internet - An essay by John Hubbard analyzing the question of what is the best way to index the Internet, with references.
ISEDB - A directory of search engines and directories worldwide, organized by geographical area and subject, includes articles on site submission, marketing, and optimization.
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.
Search Ability - A guide to directories of specialized search engines. Each directory is reviewed and classified in some detail.
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.
Searchenginez - Search forms for the most effective engines in dozens of categories from Robert Skelton. Includes reviews, ratings, webmaster tools, and tutorials.