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SEO for Drupal
Drupal has a lot of bad default behaviors for SEO. This video walk you through how to avoid some of the pitfalls most Drupal sites fall into inadvertently.
The following are some of Drupal SEO related modules that can make your Drupal site preform to the best of it's ability: Pathauto, Path Redirect, page title, XML Sitemap, Global Redirect, SEO Checklist, SEO Friend, service links, HTML Purifier.