SearchEngineWatch.com
Search Engine News and Forums. Organizer of SES (Search Engine Strategies) Conferences.
http://searchenginewatch.com/
Webmasterworld.com
Includes an active search engine optimization forum.
http://www.webmasterworld.com/
Threadwatch
Open Internet Marketing Community - News, Alerts and Articles.
http://www.threadwatch.org/
Scientific American Magazine
An article containing better web searches
http://www.sciam.com/article.cfm?chanID=sa006&articleID=0006304A-37F4-11E8-B7F483414B7F0000
HighRankings Forum
A very active forum for experienced SEOs and those new to the field.
http://www.highrankings.com/forum/
Search Engines - how does it work?
Web search engines work by storing information about a large number of web pages, which they retrieve from the WWW itself. These pages are retrieved by a Web crawler— an automated Web browser which follows every link it sees.