tedster - 5:48 pm on Jul 22, 2012 (gmt 0)
Perhaps instead of "Penguin" you should call it "scorched earth" or perhaps the "throw the baby out with the bathwater" update.
But this isn't a Penguin issue - it's a change in how Google handles host crowding. They used to only allow two URLs per domain and now they're trying a many-URL approach.
The Penguin Update happened in April 2012 and this multiple URL change is about a year old. Please let's not blur things, it's tough enough following all the Google changes.