If you are into data journalism, check out this crowdsourced list of data journalism sites and blogs. You can also add new entries yourself. Here’s an announcement on the Data Driven Journalism website. I find this list extremely useful because it provides a global perspective on data journalism including such great blogs as this one by Mirko Lorenz or Online Journalism Blog by Paul Bradshaw.
“School of Data” also provides a comprehensive data journalism course: from data fundamentals (finding data, basic analysis, common misconceptions) to data cleaning, extracting, exploration and visualization.