Fraggler - 9:27 am on Jul 18, 2010 (gmt 0)
My site which has been affected since the May change has repeated a spike I got 31 days earlier.
The rankings for my main keywords across many pages disappeared (each can be found in the last few pages of results) at the start of May - traffic dried up pretty significantly.
On the 15th of June all rankings returned to their previous highs (several at new highs) and traffic flowed rapidly. 12 hours later and the Google traffic disappeared again and so did the results.
Thursday/Friday (16th of July) all rankings returned again and disappear 12 hours later.
I don't know if this is any use to anyone but it does seem strange to have such a short boost and to be 1 month apart as well...