tedster - 10:20 pm on Sep 30, 2011 (gmt 0)
I edited the headline to this thread for a couple reasons. First, we've been tracking this new update in the thread Google Updates and SERP Changes - September 2011 [webmasterworld.com] and the first sign showed up on September 26.
And second, for some reason that article you linked to completely missed that there was a Panda update in August [webmasterworld.com]. So if we were continuing with the numbered versions (which we're not - that's going to get silly in just a few months) this Panda update would be version 2.5
I'm happy to hear you recovered your traffic. To date, we've only heard about further losses.