dickbaker - 3:08 pm on Apr 17, 2011 (gmt 0)
I remember a number of people reporting traffic surges right before Panda. I saw a big surge to 30K+ page views on Sunday and Monday (2/20 and 2/21), then the drop began on Thursday the 24th with Google page views dropping 42% by Friday the 25th.
Perhaps it's been postulated here before, but I think the surge may be designed to expose as many pages as possible to as many visitors as possible to gauge visitor behavior. Perhaps that's one of the last pieces of the algo to be applied.