I was chatting with a few folks who are convinced of a major Google update. David Ogletree was the first I know to spot this. So I revisited a WebmasterWorld and sure enough, since the 18th of this month, four more pages about a possible Google update.
But this truly does appear to be a Presidents Day Google update.
Roel at WebmasterWorld wrote:
A big drop in traffic over the weekend / last 2 days for me. Anyone else seeing this?
Followed by dozens of responses confirming this.
WebmasterWorld administrator, Tedster said:
I don't see this as a true rollback - some of the SERPs I monitor have a whole new configuration.
Based on this thread, I think this is the real deal.
Forum discussion at WebmasterWorld.