How do I modify the text on a breadcrumb?
See How to get rid of the "/blog"-page that displays all user-blogs (or change the breadcrumb-link)? I think that you will find an example on how to change a specific text of your breadcrumb.

For example, in your template.php file you can use phptemplate_breadcrumb() to search and replace text:

function phptemplate_breadcrumb($breadcrumb) {
  if (!empty($breadcrumb)) {
    $breadcrumb = preg_replace("/old text/", "new text", $breadcrumb); // This line will search and replace text.
    return '&lt;div class="breadcrumb"&gt;'. implode(' &gt;&gt; ', $breadcrumb) . '&lt;/div&gt;';
  }
}
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