Here are some examples of interactive texts:
An Online Statistics Book , developed at Rice University (also available in an IBook format).
IBook. Apple's entry into the interactive text marketplace. These are terrific resources, featuring the ability to "flick through photo galleries, rotate 3D objects, tap to pop up sidebars, or play video and audio", and more. Sadly, they do require viewing on an Apple product such as IPad or Apple computer.
Phillip Start at UC Berkeley offers an older, HTML-based, introduction to statistics called SticiGui.
Carnegie Mellon offers a very nice online course on Statistical Reasoning.
Here are some online texts:
The OpenStax College initiative, sponsored by Rice University, has dozens of books available for free. They are not currently interactive.
The American Yawp is a free and online collaboratively built textbook on American History (not currently interactive).
Mario Wutrich from ETH Zurich, makes his book/lecture notes on Non-Life Insurance: Mathematics & Statistics freely available.
Mario V. Wuthrich, ETH Zurich, and Michael Merz, University of Hamburg, make their book/lecture notes on Stochastic Claims Reserving Manual: Advances in Dynamic Modeling freely available.
The Casualty Actuarial Society (CAS) makes the book by David Bahnemann, Distributions for Actuaries, freely available.
Marcel B. Finan, An Introductory Guide in the Construction of Actuarial Models (2013).
Overview of online actuarial resources at a page by Myron Hlynka.