Shawn Zirbes is the Chief Technical Officer for Integrated Content Solutions and CAD Technology Center. A few years back he summarized his experience with Revit families in a book that applied to 2010 content. Well, he is back and expanded for 2012.
I use the 2010 version as a resource at work and as required reading in my college courses. A concise yet in depth look at families that is easy to read for the beginner, yet full of cutting edge information for the super user. Neatly organized and well presented.
Find out more or buy the book by clicking here.