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g1smd - 2:49 pm on Aug 17, 2006 (gmt 0)
I see many recently created new Supplemental Results representing content from just a few months ago. These are where the content has been edited very recently (and searches for the new content point to a non-Supplemntal Result), or where on-site duplicate content existed but the alternative (non Supplemental) URLs have now been filtered out (in one case the filtering was through robots directives to get certain URL formats delisted).
What I see on gfe-eh.google.com is that Supplemental Results from 2005 are now all gone. Previously there were many going back as far as 2005 June.