It looks like over the weekend, starting maybe this past Friday or Saturday and picking up speed on Sunday that Google pushed out another search ranking algorithm update. I saw chatter from the SEO community over the weekend and the automated tracking tools are also picking up signs of an update.
The issue I have right now is that ongoing WebmasterWorld thread is not loading, I think there is a domain name issue at WebmasterWorld. But there was a nice amount of chatter at that forum over the weekend. The Black Hat World forums also has chatter. Here is some of the chatter I could find, with WebmasterWorld being down at the time I am writing this:
Seems like another update is underway. Lost 85% of traffic.
Yeah, definitely another update rolling out.
Without a doubt another major update rolling out. All websites shifted 10-30,000 organic searches a day. About 20-30% of website traffic a day.
The tools also show some signs of a Google algorithm update.
Advanced Web Rankings:
Check out your rankings and traffic and let us know what you are seeing.
Forum discussion at WebmasterWorld & Black Hat World.