Top Drupal Modules that you can't live without

The CAPTCHA module provides this feature to virtually any user facing web form on a Drupal site

The Views module provides a flexible method for Drupal site designers to control how lists and tables of content (nodes in Views 1, almost anything in Views 2) are presented. Traditionally, Drupal has hard-coded most of this, particularly in how taxonomy and tracker lists are formatted.

The featured content module lets you very easily create related/featured content blocks on your Drupal site

The XML sitemap module creates a sitemap that conforms to the sitemaps.org specification.

The Pathauto module automatically generates path aliases for various kinds of content (nodes, categories, users) without requiring the user to manually specify the path alias.

Cross browser compatible jquery to transform your multilevel menus into click and expand menus

This project allows you to add meta tags to Drupal pages, both manually and automatically based on various settings. Paying attention to meta tags such as keywords and description can help obtain better search engine positioning.