The rumored-but-rarely-talked-about topic of the "deep web". A web underneath the web, filled with petabytes of data and information that's out of the reach of your standard Google, Bing, or Yahoo search bar.

A guide to search engine marketing and search engine optimization. Forums, reviews, articles, ratings, and frequent newsletters. Paying members receive access to extra content.

Directory of hundreds of search engines, organised by country and topic.

A user's guide to Web searching with features, comparative analysis, strategies, discussion, news and reviews.

Directory of databases and specialty search engines from Bright Planet.

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.

Charles Knight maintains a list of the top 100 alternative and niche search engines. Includes news, reviews and debates on search engines.

Conference for Internet researchers to hone their skills and refresh their search competencies, held September 14-15, 2009, Washington, DC. Includes registration and past event schedules and speakers.

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.

Directory listing hundreds of search engines, categorized, described and rated.