Drupal 6 Social Networking (by PACKT Publishing) will be extremely handy to anybody new to Drupal and those looking for recipes to build community sites. It gives you the basic understanding of how Drupal works and what buttons you need to push to achieve desired results. It has great step by step tutorials (with screenshots) on the vast majority of common tasks you do with a Drupal site: content, menu and user management, permissions, adding and configuring modules, etc. It also helps you understand how Drupal modules integrate with each other to extend site functionality.