Your second question: I am using 2 books by Stephen Few as guideline for my design: “Now You See It: Simple Visualization Techniques for Quantitative Analysis” and “Information Dashboard Design: The Effective Visual Communication of Data” which also contains the 13 common pitfalls. I didn’t know about the PDF your referring to, so thanks for that! It’s a nice quick reference that way…

I understand it is still a work in progress, but are there additional data sets you want to display at the same time?

Have you or will you objectively test it against Stephen Few’s “13 Common Pitfalls in Dashboard Design”? (Found in detail at http://www.perceptualedge.com/articles/Whitepapers/Common_Pitfalls.pdf )