That resonated with something that I was talking about with the crawl/index team. internetheaven, was that post about the site in your profile, or a different site? Your post aligns exactly with one thing I've seen in a couple ways. It would align even more if you were talking about a different site than the one in your profile. :) If you were talking about a different site, would mind sending the site name to bostonpubcon2006 [at] gmail.com with the subject line of "crawlpages" and the name of your site, plus the handle "internetheaven"? I'd like to check the theory.
Just to give folks an update, we've been going through the feedback and noticed one thing. We've been refreshing some (but not all) of the supplemental results. One part of the supplemental indexing system didn't return any results for [site:domain.com] (that is, a site: search with no additional terms). So that would match with fewer results being reported for site: queries but traffic not changing much. The pages are available for queries matching the supplemental results, but just adding a term or stopword to site: wouldn't automatically access those supplemental results.
I'm checking with the crawl/index folks if this might factor into what people are seeing, and I should hear back later today or tomorrow. In the mean time, interested folks might want to check if their search traffic has gone up/down by a major amount, and see if there are fewer/more supplemental results for a site: search for their domain. Since folks outside Google couldn't force the supplemental results to return site: results, it needed a crawl/index person to notice that fact based on the feedback that we've gotten.
Anyone that wants to send more info along those lines to bostonpubcon2006 [at] gmail.com with the subject line "crawlpages" is welcome to. So you might send something like "I originally wrote about domain.com. I looked at my logs and haven't seen a major decrease in traffic; my traffic is about the same. I used to have about X% supplemental results, and now I hardly see any supplemental results with a site:domain.com query."
I've still got someone reading the bostonpubcon email alias, and I've worked with the Sitemaps team to exclude that as a factor. The crawl/index folks are reading portions of the feedback too; if there's more that I notice, I'll stop by to let you know.
[edited by: Brett_Tabke at 8:07 pm (utc) on May 8, 2006]