Google just pushed an algorithmic ranking change - Per Matt Cutts

[C0ldf1re]

... Their algo's always have been and always will be flawed, and damaging to the innocent. No matter how much the "webmaster experts" know, and think they know, will not immunize one against flawed algo's that throw the baby out with the bathwater...

Well put as always, Clint!

Google always say that they must keep their algo's secret to stop people gaming the system. Another reason is surely that they cannot bear the thought of people seeing how badly those algo's are implemented.