What to read about site optimization?
The technology of site optimization, as well as the technology of search, is developing rapidly. Standards are not yet defined, and the best books are not yet written. That is why the best source of information is the Search Engines themselves.
In the Internet there are a lot of sources of information. But you should understand that not all articles are up-to-date. Everything is changing fast and unexpectedly, especially concerning extreme methods of optimization. What was a sure way to rise to the top yesterday may not work at all today.
Among up-to-date sources - a specialized mailing list on site: http://webpronews.com/
However, the most reliable way to keep abreast of events is participation in forums and newsgroups, where the algorithms of Search Engines and the technology of site optimization are discussed: http://www.webmasterworld.com/category5.htm