I've just finished reading Interactive Data Visualization for the Web (An Introduction to Designing with D3), by Scott Murray. This book covers the basics on how to use D3, a library to make it easier to do data visualizations (see the very cool gallery for an example of what has been done with it).
This is Early Release Version 3 of the book, so there may be changes in the finished release.
The book covers the basics on how to use D3 – starting with a bar chart all the way to how to convert shapefiles and display maps.
One thing I found interesting is how similar using D3 feels to JQuery. They very much are helper libraries. I expected D3 to be more of a delphi component – point it to the data, set a few parameters and it goes from there. But in reality, there will be a quite bit of code for anything you do. The advantage is that it is very, very flexible.
Overall, I liked it. The examples all work and are useful, and it took me about 4 hours to read it, including trying out all examples and following some of the links to useful resources.