Is google no longer showing Supplemental next to listings because I just did a few site: searches for my sites and things that were supplemental are not now. I couldn't find one across 3 sites and 400 results...
Several weeks ago Google decided not to show the tag Supplemental results anymore. Be aware: Supplemental Results still exist but you don't see it.
I think there's still a way to search with the "site:www.mysite.com/..." feature to find out if listings are in supplemental results. It involves adding something to the end of the url, does anyone remember what it is?
They said that they will add something to web master central too to help track these. But I am not sure if its on right now. Haven't been in there in a week or two.
use a long phrase from your page and also look at the cache date if you dont rank for that phrase in google and the cache date is old, bingo also if you have few links to that page(internal + external), content not unique you have another reasons to believe is in supplemental is easy
http://www.google.com/search?q=site:www.mysite.com *** -adghasdtrb I think this is the command for supplemental site search