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The point of my post is....am I missing something here?
generic directories: strongestlinks.com/directories.php
Regional or subject-specific directories: strongestlinks.com/specific_directories.php?sortcolumn=PRa
You might want to check to see how the page content ranks as even though Google shows a PR 0 for the page you might see the page or content is tops in the SERPs, I know this as one of my pages shows a PR 0 but literally dominates it's area - don't know why, maybe because of all the URL parameters, but it's working and has been for years regardless of the PR.
I think the overall site PR is what it's leveraging and nothing more.
If you check it out and that's not the case, run.