Taxonomy breadcrumbs. All credit to Dave Ross (@csixty4).

override_theme_breadcrumb.php

// to be added in your theme's template.php file
/**
 * Override theme_breadcrumb().
 *
 * Base breadcrumbs on paths e.g., about/our-organization/bob-jones
 * turns into About Us > Our Organization > Bob Jones
 */
function sndev_breadcrumb($breadcrumb) {
  $links = array();
  $path = '';
  $arguments = explode('/', request_uri());
  foreach ($arguments as $key => $value) {
    if (empty($value)) {
      unset($arguments[$key]);
    }
  }
  $arguments = array_values($arguments);

  $links[] = l(t('Home'), '<front>');

  if (!empty($arguments)) {
    foreach ($arguments as $key => $value) {
      if ($key == (count($arguments) - 1)) {
        $links[] = drupal_get_title();
      }
      else {
        if (!empty($path)) {
          $path .= '/'. $value;
        } else {
          $path .= $value;
        }

        $menu_item = menu_get_item(drupal_lookup_path('source', $path));

        if ($menu_item['title']) {
          $links[] = l($menu_item['title'], $path);
        }
        else {
          $links[] = l(ucwords(str_replace('-', ' ', $value)), $path);
        }
      }
    }
  }

  drupal_set_breadcrumb($links);
  $breadcrumb = drupal_get_breadcrumb();
  if (count($breadcrumb) > 1) {
    return '<div class="breadcrumb">'. implode(' &rsaquo; ', $breadcrumb) .'</div>';
  }
}

page_taxonomy_breadcrumbs.info

name = Page Taxonomy Breadcrumbs
description = Adds custom breadcrumbs (based on taxonomy) to product Pages. Works in conjunction with theme template.php
package = SN Custom
core = 7.x
;files[] = sn_product_page.module
files[] = sn_product_page.tokens.inc

page_taxonomy_breadcrumbs.tokens.inc

<?php

/**
 * @file
 * Token integration for the Pathauto module.
 */

/**
 * Implements hook_token_info().
 */
function page_taxonomy_breadcrumbs_token_info() {
  $info = array();

  $info['tokens']['array']['join-term-path'] = array(
    'name' => t('Joined taxonomy path'),
    'description' => t('The array values each cleaned by Pathauto and then joined with the slash into a string that resembles an URL.'),
  );

  return $info;
}

/**
 * Implements hook_tokens().
 */
function page_taxonomy_breadcrumb_tokens($type, $tokens, array $data = array(), array $options = array()) {
  $replacements = array();

  if ($type == 'array' && !empty($data['array'])) {
    $array = $data['array'];

    foreach ($tokens as $name => $original) {
      switch ($name) {
        case 'join-term-path':
          module_load_include('inc', 'pathauto');
          $values = array();
          foreach (element_children($array) as $key) {
            $value = array_pop(explode('/', drupal_get_path_alias("taxonomy/term/$key")));
            $values[] = pathauto_cleanstring($value);
          }
          $replacements[$original] = implode('/', $values);
          break;
      }
    }
  }

  return $replacements;
}