Put this up on our Facebook, but for those who don't like us (GO DO IT NOW) it's the changes to Google's Algorithms!
http://www.seomoz.org/blog/6-changes-every-seo-should-make-before-the-over-optimization-penalty-hits-whiteboard-friday
http://www.seomoz.org/blog/6-changes-every-seo-should-make-before-the-over-optimization-penalty-hits-whiteboard-friday