Anyone here do Data Visualizations or similar design work?

I'm looking for resources to get a more in depth base on the subject. Data visualizations have always interested me but it's hard to find good resources for how to design one properly. (And the things to really consider) I've found some talks on YouTube, a Udacity course, coursera course, a MIT course, and some other stuff but a lot of them tend to focus very heavily on the tools and not on design as much. Tools are fine (basically it's all d3.js) but I'm really interested in the design process more than the engineering/programming process right now.
Maybe I just need to read more about design in general. I'd like resources on that too if anyone knows some.

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