As a part of Physics World Discovery series that summarize active research directions in physics for final year undergraduates and new PhD students, a new book on "Rydberg Physics" by Nikola Šibali? (CQOM, Aarhus University, currently at Institut d'Optique) and Charles Adams (Durham University) has been published. Being specifically made for a new electronic format, the book has a number of interactive figures* that allow exploration of physics effects under range of parameters. It is freely available from the publisher web page:

http://iopscience.iop.org/book/978-0-7503-1635-4

*Note: interactive figures work in web version (http://iopscience.iop.org/book/978-0-7503-1635-4/chapter/bk978-0-7503-1635-4ch1), and EPUB version of the book, if used with tablet device that supports EPUB3 (e.g. iBook in Mac/iPad, Gitden Reader in Android, Document viewer Xreader on Linux).