Shatner - 12:06 am on Oct 1, 2011 (gmt 0)
Just so it's all in one place, here's a breakdown of what I've experienced as posted in other threads:
February Panda 1.0 - My site was Pandalized and lost -50% of google traffic
March Panda 2.0 - My site was Pandalized further and lost another 25% of google traffic, to make a total of -75% lost.
June/July Panda X? - My site began to recover from Panda and over the next month eventually fully recovered +75%
September 26 Panda Y - My site saw further gains in Google traffic and on that day recorded more google referrals than we've ever recorded before. +15%
September 27 Panda Z? - My site's recovery was taken away and I lost all of my recoveries. The numbers have continued to drop bit by bit over the course of this week. -75%