Google has done at least two minor updates to the Panda 2.5 update that I know of.
The first was around October 9th or so and now one, confirmed by Google's Matt Cutts, the night of October 13th.
Matt Cutts tweeted a confirmation:
Here are some posts from the forums on this update:
My pandalized site got hit even worse with the minor update since the changes I made after the last one have not had time to fully filter through google results yet.
I noticed that my competitor had a slight recovery last night, I did not know it was because of this minor update then though.
Same here. was hit on sept27th, recovered fully on october 4th, had a spike of traffic on october 13th and was hit around 11m uk time on the 14th. 80% drop. Thanks google.
This is ridiculous.
Did you get hit or improve since the 13th?
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