As you know Yahoo has an update weeks ago and then I can easily recognize this set of SERPs because my site is penalize from many #1 to page 3 onwards.
Then the strange things is that for 3 occasions I have noticed that Yahoo is reverting back to the old set of SERPs and when this happens, there will be NO OVERTURE ads display in the SERPs. I do not know if overture is down or what.
But when there are overture ads, new set of SERPs is display. When there overture ads are not loaded for the same keyword (server down or script mulfuctions or engineer screw up search script...) then old set of SERPs appear.
This is the first findings.
And for the 2nd findings, just like Google. If you want to see the old set of SERPs from the new set, simple put the search term along with a -keyword
Keyword1 Keyword2 -asdafdd
And penalize site should go back to #1.
I also suspect the reason I get penalize is that I change my site links from 'Home' to 'Keyword Phase' so probably that trigger the yahoo version of OOP. haha.