I've been wondering the same thing for a while.
Here is my conclusion: This is just an other unfinished Magento feature like there are others (see the
<layout version="0.1.0"> discussion for example).
I base my conclusion on the fact that on in the admin page file (
page.phtml) there is no line that should show the breadcrumbs. It should be something like this:
<?php echo $this->getChildHtml('breadcrumbs') ?>
But the main reason that lead to my conclusion is this method in the breadcrumbs block:
protected function _beforeToHtml()
// TODO - Moved to Beta 2, no breadcrumbs displaying in Beta 1
// $this->assign('links', $this->_links);
If you add the line
<?php echo $this->getChildHtml('breadcrumbs') ?> in
page.phtml and uncomment
$this->assign('links', $this->_links); in the method above you should see the breadcrumbs but not all the pages will have correct breadcrumbs. See for example the add/edit product page. This is because the breadcrumbs are not added in all the pages.
I guess we have to wait for the
Beta 2 as stated by the comment in the code above :).