tedster - 2:53 am on Sep 12, 2010 (gmt 0)
Agreed incrediBill - the first reported example I got was accurate and the site was seriously suffering because of the change. I checked a few more terms and they also had changed - the Suggestion had changed from plural to singular and the greatest traffic had been on plural.
But since those first reports, I tried to broaden the data set and I can see that this is not a uniform change at all. As you said - it may hit only certain terms or market niches.
I'm guessing there will now be regular Suggestion updates to go along with ranking algo updates. Maybe they were always there and just escaped notice, I don't know. I do know that a Suggestion update definitely lit up my radar last weekend, just a few days before the launch of Google Instant.