I recently found Nick Lewis’s Blog, which illuminated a few essential Drupal modules, so I thought I’d share with you the ones I find the most effective for myself.
Admin Menu : This will make your life very easy, as an admin.
Path Auto : Automatically names the path to your newly created pages. Essential if you don’t want node/16 type paths.
Page Title : Allows you to rename the titles of the pages, alternative to path auto above.
WYSIWYG : Essential editor. Must have.
Mollom : For content validity. If you’re enabling comments, get this.
This is a start. I hope it helps you a bit!