How wpmu.org recovered from the penguin update
To quote Matt on Twitter :-
“Minor weather report: We pushed 1st Penguin algo data refresh an hour ago. Affects <0.1% of English searches. Context: http://goo.gl/4f7Pq”
Matt Cutts, head of Webspam Google tweeted this on 26th May. It clearly indicates that Google has refreshed its data for the first time after the Penguin update. You may share experiences about your site after this update in the form of comments below.
To know more about the Google Penguin Update you may visit:- Google Penguin Update