I think Ohno may concur on this... Traffic did not drop appreciably, but conversion fell dramatically. Again, perhaps a little buyer savvy in there, but as of recent, the distracting number of options, tabs, services, social networking attempts and the everloving everflux continually destabilizes the serps.
The Venice update includes 40 individual quality updates? How can you expect stability in the face of that many changes?
[edited by: backdraft7 at 1:38 pm (utc) on Apr 2, 2012]