If you haven’t been affected by Penguin yet then the best thing is to make sure you won’t be, before its too late. For a lot of people though it is too late and everyday that a penalty remains or the filter affects your ranking you are losing money so you need a quick penguin recovery if possible
There are actually two potential issues resulting from Penguin and they need to be dealt with in different ways. One is that the algorithm may simply not favor you as much any more: many people have commented on the fact that authority sites have benefitted a lot from the Penguin update and the most recent Panda update.