aristotle - 2:03 pm on Oct 3, 2012 (gmt 0)

yes. 500+ algo launches/year mean 1-2 a day. I know of at least one other algo rolling out over same timeframe for example.

Thanks Marketing Guy

This seems to confirm the reports in other threads of what appears to be a separate major algo update rolling out almost simultaneously with the recent EMD update. This other (un-named) update apparently had a significant effect on quite a few sites. I think that one of my small hobby sites (non-EMD) was hit, dropping from #2 to #5/6 for its main keyword in the Google SERPs.