Built-in plugins

Module page: http://drupal.org/project/crumbs

By default, Crumbs can generate breadcrumbs based on:

• Menu hierarchy (child and parent items) and title (translated)
• Taxonomy (child and parent terms, tagged entities).
• Forum hierarchy and posts.
• existing path alias fragments (alias is aa/bb/cc, so we consider aa/bb as the parent path)
• Entity reference fields.
• Organic groups (OG)
• Entityreference prepopulate on node/add/* pages.
• Custom token patterns for entity types / bundles.
• Core blog.module
• Core comment.module
• System path fragments (aa/bb/cc is considered a child of aa/bb)

It is quite easy to add a custom module that will make breadcrumbs based on node type and other criteria.