Nitin Yawalkar

RDFa Breadcrumb provide links back to each previous page the user navigated through to get to the current page or – in hierarchical site structures – the parent pages of the current one.
It gives you a new template tag called <code>rdfa_breadcrumb()</code> that you can place anywhere in your template files. It has inbuilt RDFa content markup, so this will help Google to recognize and display the breadcrumbs on search results as well.
Check out the screenshots.

RDFa Breadcrumb

An easy template tag for showing a breadcrumb menu on your site and on google search results with built in RDFa Markup.

Erik Ford

Heavy Heavy

With Trailblaze, you can add breadcrumb navigational links to your WordPress theme by using the template tag, <code>wap8_trailblaze()</code>. This template tag can be added to the following templates:
<ul>
<li>Archive Templates (categories, tags, post formats, custom post types, custom taxonomies, date based archives)</li>
<li>Singular Templates (post, page, custom post type)</li>
<li>Search Template</li>
<li>404 Template</li>
</ul>
For more information, please see this <a href="http://erikford.me/plugins/trailblaze-breadcrumbs-plugin/" rel="nofollow ugc">blog post</a>.

Trailblaze

Add breadcrumb navigation to your posts, pages and custom post types with a template tag.

RDFa Breadcrumb vs Trailblaze