I am no financial analyst but the news that I continue to read regarding the devaluation of the United States dollar as well as other currencies is staggering. The following graph shows that quantitative easing (QE = printing money) isn't just going on in the US but around the world. This graph basically suggests that in 2008 and 2011 roughly one third of the world's market capitalization was on world federal bank balance sheets that resulted from the federal banks printing money through some form of quantitative easing.
Read the full article from which this graph was taken titled Living In A QE World at Ritholtz.com. They provide much more information and shares more detail on each of the 8 central banks.