I manage a site that has "Industry News" showing manually/editorially chosen and relevant press releases that relate to the brands and products on the site. The "News Sections" seem to have taken a hit on referrals between the 24-26th. (Which they should, the content is for readers, not search engines, and has always been properly attributed)
I'm watching to see if the entire site as a whole will be affected as well. Too early/not enough data to know for sure yet, since the sites are also driven by seasonality.
On a few other sites I take care of... I spotted very erratic traffic behavior around the same time (the 24-26th) where the referrals are spiking and diving, spiking and diving, etc, etc. Its not like the old pogo-sticking we talked about in other threads.... its very extreme and very daily. (Up-big, Down-big, Up-big, Down-big, etc)
Interesting to watch anyhow... which is the ONLY thing I can justify doing right now. Let it wash, focus on the visitors... Let Goog do its own thing and take what I can get! :-)