SEO Chat
http://www.seochat.com/
Articles, Tools, Useful Correspondence, Search Engine Optimization, Google Optimization and SEO Chat

Google Adwords Tips for Success
https://adwords.Google.com/select/tips.html
Google Adwords campaigns can dramatically increase traffic to your website through focused keyphrases.

Bruce Clay
http://www.bruceclay.com/
A guru of the search engine marketing world.... visit this website for some usefool tools and tracking software which is free to use.

Google Webmaster Guidlines
http://www.Google.com/support/webmasters/bin/answer.py?answer=35769
An excellent resource and guideline to build search engine techniques and services around.

Google sitemap
http://www.Google.com/webmasters/sitemaps/docs/en/about.html
A crucial resource for any SEO understanding what Google sitemaps are all about. Implenting Google sitemaps in your website is highly recommended.