serpsup - 3:54 am on Nov 5, 2012 (gmt 0)
I'm also seeing a big change (20-25% increase in search traffic) starting sometime yesterday and all of today. Panda 1.0 US site. I've seen lot's of fluctuations like this corresponding to Panda refreshes. This time I'm seeing a noticeable shift in keywords and improved rankings for both short and long tail since yesterday. *
* - However, I just removed a ton of search facets via robots.txt Disallow so not sure if some of what I'm seeing is related to adjustments from that. The number of others that are seeing something makes me suspect a Panda refresh or algo update now.