Navigate is a module that adds non-intrusive navigation tools for site administrators, including customized ajax-based site search, a favorite widget and a collapsible menu widget.
Drupal Administration Menu provides a theme-independent administration interface (aka. navigation, back-end) for Drupal. It's a helper for novice Drupal users coming from other CMS, a real time-saver.
This module adds some common-sense usability to Drupal's menu system