Whitey - 10:52 am on Oct 26, 2011 (gmt 0)
Agree - huge increase in low quality traffic returned on Oct 14. Conversion rates dropped in compensation for traffic increases.
It could have something to do with Google holding back on further site quality improvements that it wants before releasing traffic on top ranking pages and keywords. Definitely think it's a "trust" throttle - the traffic release is close to an even double.