The top three of the leading Search Engine Optimization sites out there are seochat.com, seobook.com and seomoz.org
Seobook.com gets more traffic than seochat.com and seomoz.org
Search engine optimization (SEO) is the process of improving volume or quality of traffic to a web site from search engines via search results.
The earlier a site appears in the search results list, the more visitors it will receive from the search engine. SEO may target different kinds of search, including image search, local search, and industry-specific vertical search engines.
Leading search engines, Google, Yahoo! and Microsoft, use crawlers to find pages for their algorithmic search results. Pages that are linked from other search engine indexed pages do not need to be submitted because they are found automatically. Some search engines, notably Yahoo!, operate a paid submission service that guarantee crawling for either a set fee or cost per click.