As I've raved about in my earlier post, Annie Lausier' Calendar Approach in response toFlowingdata.com's "10 Visualizations for Number of Days to Pay Your Taxes" was so far beyond peoples expectations that it received comments almost bordering on adulation, prompting one to comment, "This was definitely one of my favorites, partially because of the smooth interaction and partially probably because I wasn't expecting it."
Her work is available here. It features a very intuitive approach, and a two-way interaction between the dates and the states. In my attempt to see how far I can progress in two hours of working with the data, I came up with the following.
I'm happy to leave it at the stage it is now. Clicked on any of the pink-shaded dates colors the states for whom it is the Tax Freedom Day.