SEO isn’t magic, largely its following the rules and tending to the details. One of the on-going tasks is monitoring the ever changing criteria used by Google to rank websites. If you think this is minor, consider that Google changed its algorithm over 500 times in 2011 alone. The most recent update in march of 2012 listed here will have many repercussions. And even when Google discloses the changes they have made, we really can’t assess he impact of those changes until we test and observe the results.