Ever since April 24th, the SEO world has been one of confusion, to say the least.
The reason for this is that on the 24th, Google released their Penguin update. If you aren't familiar with what Penguin is all about, here's what Wikipedia has to say.
Google Penguin is a code name for a Google algorithm update that was first announced on April 24, 2012. The update is aimed at decreasing search engine rankings of websites that violate Google's Webmaster Guidelines by using black-hat SEO techniques such as keyword stuffing, cloaking, participating in link schemes, deliberate creation of duplicate content, and others.