If you have been interesting in moving from creating content in flash, to creating content in "HTML5" that can be viewed on any standard web browser, this book is a great introduction to Adobe's newest tool.
For a veteran of Flash, it compares the two side by side, showing what Edge can currently create (circa mid 1990s Flash). The book introduces and shows the new interface, teaches you how to work with tools and the timeline, as well as adding interactivity to your HTML5 based content. The book does a great job of showcasing Edge's strengths and weaknesses compared to using Flash.
I found this book to be a great introduction to the Edge platform, and would think anyone that currently develops Flash content, or has been interested in getting into interactive web development would find interesting and useful.