SEO Checklist is a must have Drupal Module for all Drupal sites. It creates a checklist with handy links to the modules/settings that help make your Drupal installation as SEO friendly as possible.
Now I know what you might be saying... "I'm a Drupal expert, I don't need a module to tell me what modules I should be running." Well, I don't believe you. Even the most grizzled developer can forget to add a module or *gasp* not know every Drupal module in existence.