A thread at WebmasterWorld that was created during the SES show last week and has grown to almost 20 pages long so far, discusses a supplemental index issue in the index. You know what I mean when I say supplemental index, right? If not, I have a picture here of what it looks like. Thing is, what results go into the supplemental index changes over time. Now it seems that too many pages have been falling into this index. The thread at WebmasterWorld was coined Supplemental club: Big Daddy coming - Part 1 has a response from GoogleGuy in message #195 saying;
Based on the specifics everyone has sent (thank you, by the way), I'm pretty sure what the issue is. I'll check with the crawl/indexing team to be sure though. Folks don't need to send any more emails unless they really want to. It may take a week or so to sort this out and be sure, but I do expect these pages to come back to the main index.
That is good to hear.
