Last week I got a nice tip from my colleague Jeroen van der A I want to share with you. He mailed me about this program/challenge by Juice Analytics on data visualization: 30 Days to Context Connection. It is a collection of articles, videos and assignments to build some great visualization skills. I will go through the program and let you know in a few weeks what my favorite content was.
To get you started I posted the video assignment of the first day below. Also I recommend to check out the Juice Analytics website, which is a great resource for business intelligence professionals. It is loaded with examples that should give you some new ideas.