It's been a year since the first version of Bitcoin Step by Step came out. A lot has happened since then. I updated and expanded the book to include more detail that people had asked for from the first edition.
It's available on Amazon in Kindle format.
http://www.amazon.com/Bitcoin-Step-by-ebook/dp/B00A1CUQQUFree Kindle View for any Operating System (Win, Mac, Linux, iPad, Android, etc…)
If you need a FREE kindle viewer you can download for just about any OS :
http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000493771