Nice thread going on here
All kidding aside, there was a change, I'm assuming you are referring to the indexing to WP Blogs and it's been happening for the past week. There has been some changes but they are slow, I'm assuming most people who are "splogging" are going to get hit more....my analytics stats are pretty weird right now, saw a switch from 60% se traffic to 25%, 75% to 50% on another and the rest were minor in 1 day
There is no moment of discovery here, it's been happening