I’ve just completed adding some new formats for my recent eBook “Getting Started with SharePoint Online for Enterprises”. Apart from PDF you’ll now find that title available in both ePub and Kindle format for the same price.
Given that success, I am going to start working back through my previous titles and also convert these so stay tuned.
The best location for all my works, free and paid, is http://www.ciaops.com/downloads/
Look out for a new title on Lync very soon!