top modules

Coming from a web design and development background, one of the things that was most important to me if I was going to pursue the Drupal dream, was it's ability to be search engine friendly. 5 months later and with as many Drupal site builds under my belt, I'm now pretty confident that I have the right SEO toolset. This writeup at codegobbler.com details my top 5 modules for optimising Drupal for the search engines. What do you think? Am I missing anything?