By default, Drupal 6+ use the Navigation menu for the breadcrumb. This module allows you to use the menu the current page belongs to for the breadcrumb.
As an added bonus, it also allows you to :
- Append the page title to the breadcrumb (either as a clickable url or not)
- Hide the breadcrumb if it only contains the link to the front page.
- Generate the breadcrumb from the URL structure if content does not belong to a menu (7.x-1.6 and older only)