diberry - 5:15 am on Jun 9, 2012 (gmt 0)
It didn't stick. Through the noon hour, I was up 94% on Google traffic compared to yesterday. Then it plummeted. The exciting long tail searches didn't completely go away, but they were significantly diluted by the old search phrases, and my rankings on the old phrases were lower than the long tails, so the end result was that I'll have less traffic today than I had yesterday, despite doing so great up until the 1pm hour.
I also noticed something interesting, but possibly meaningless: before 1pm, I wasn't seeing as many "secure searches" as usual - that's where the user is logged into the Google account, so Google hides the search phrase from the referral string so analytics packages can't pick it up. After 1pm, it went back to the normal amount. Secure search visitors seem to behave like other visitors, so I don't know why this would happen.
I should mention that my traffic typically peaks on Thursday and troughs on Saturday, so some fall was to be expected this afternoon. But this struck me as a big fall that happened abruptly. I mean, at NO point since Penguin struck have I been up 94% compared to the day before, but even that got wiped out to bring me back down to my usual post-Penguin numbers.