These tutorials have been expanded into a book, Interactive Data Visualization for the Web, published by O’Reilly in March 2013. Purchase the ebook and print editions from O’Reilly. A free, online version includes interactive examples. Download the sample code files and sign up to receive updates by email.
Follow me on Twitter for other updates.
These tutorials have been generously translated to Chinese (简体中文) by Wentao Wang, Japanese (日本語版) by Hideharu Sakai, Russian (русский) by Sergey Ivanov, and Spanish (Español) by Gabiel Coch.
Also see my video course, “An Introduction to d3.js: From Scattered to Scatterplot.”