Aaron Wall has found a site search command which allows you to view all your Google supplemental index results.
“If you want to view ONLY your supplemental results you can use this command site:www.yoursite.com *** -view“
Last September Google allowed the checking of supplemental index results using a site:www.domain.com ** query but this stopped working a couple of weeks later. Hopefully this one will remain active as it’s a very useful and effective way to find which webpages may have become orphaned or contain duplicate content (two common reasons for supplemental results). If your site does have a high ratio of results in the supplemental index here’s an excellent guide on how to avoid them.