In April 2012 Google began a significant algorithm update with Penguin 1.0, designed to help sites offering valuable original content by punishing sites trying to webspam the Google system with 'black hat' techniques. This week Penguin 2.0 went live and Google suggested that it would have a greater impact and go deeper into a site's content.
The SEO blog Audience Bloom provided a look at Penguin's history, including some detail on how it works and what a site should do if it sees it rankings lowered. Searchmetrics offered the first research showing how rankings had changed this week for different types of sites. Kaiser The Sage published a plan for link building in a Penguin 2.0 world and Website Magazine looked at content practices that will help sites to earn Penguin's favor. Search Engine Journal listed specific tactics that sites could use to optimize for Penguin and, if all else fails, Search Engine Guide created a four step program for recovering from a Penguin penalty.
Penguin is designed to protect sites that offer value and engage their customers, the SEO job ahead is to make it clear that visitors are coming and returning to the site for the right reasons.