Recently, I created a Kindle eBook version MES and will soon have an iBook version in ePub format on the iTunes bookstore. I like eBooks because they can keep the price of technical books down and the author can make corrections and have a closer relationship with their readers through website such as mine at jackwlewis.surberstation.com. I read awhile ago that eBooks now have 25% share of all books sold in the US.
Now that Apple has come out with iBooks, I've discovered a way to make my future books interactive with Apple's "widgets" so I can have lab projects and simulators built into my book. I'm working now on a series of iBooks that will explore the fascinating world of feedback control systems. The first volume in this series entitled "Feedback Control Systems Demystified - Volume 1" should be out in a few months. In the meantime, I have posted on my website a sample widget you can experiments with. Let me know what you thinks and/or what you would like to see.