QUOTE(thx1138 @ Jan 16 2007, 12:20 PM)
QUOTE( name='Jill' date='Jan 16 2007 @ 02:07 PM')
Is it in supplemental results?
Yes Jill, it appears to be.
Right now, the most common cause of Supplemental Results listings, according to people like Matt Cutts, Adam Lasnik, and Vanessa Fox, is a lack of trusted inbound links.
Google is now doing a much more frequent crawl of pages in its Main Index, but it appears to be recrawling the Supplemental Index no more than once a month (perhaps longer but I'm still checking page updates and don't have a firm idea of the timeframe).
If a majority of your inbound links slipped into the Supplemental Index, your own pages would have gone Supplemental. You can see how many pages on your site are Supplemental by doing a site:
This behavior became most apparent in the weeks following Thanksgiving 2006, but it may have been implemented much earlier, probably by October 15 or so. I think that it took Google 1-2 months to shake sites out of its Main Index that were no longer considered to be trustworthy (because of their lack of trusted inbound links).