There are many outstanding blogs addressing a variety of data visualization topics. All blogs have their own RSS feeds, if you would like to add them to your aggregator service.
Please visit Excel for Educators to see my current blog reads. They are listed in the sidebar. Additional sources are below.
Blogs
Wired Science Map Lab
The Quantified Self blogs about "tools to know your mind and body."
Visual Loop: "The world of data visualization and infographics for professionals, academics, students and anyone curious about it."
Jeff Clark (Neoformix)
Randy Krum (Cool Infographics)
Pere Millán (sciencegraph)
Be sure to check out the "Twitter Lists" associated with these users to either subscribe or to find other sources to follow.
Other
7 Visualization Groups on Flickr with links to groups devoted to Infographics, Diagrams, Maps/Charts, and more.
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