http://www.searchengineguide.com/llo.../1125_bl1.html
technical analysis
With the huge number of postings on all the various forums, concerning this update, most people don't know where to start looking for information about the recent Google update. The following is an attempt to put down rationally (I hope) most of the information that is known and the (unproven) theories behind the update algo.
http://www.nytimes.com/2003/11/20/te...4bNOfb6Zvt6okA
NY Times article
But lately a new strategy has emerged that is raising questions about business ethics and the nature of online competition. Because search engines like Google give weight to sites that are linked to other sites, companies set up networks, creating or encouraging others to create large numbers of sites that sell the same products and then linking them together. If the strategy works, what the searcher sees is a list of links that lead back to the same product or company.