I read McNallen's new book, Asatru: A Native European Spirituality, on the plane ride last week. It was pretty good. If you've been following what he's been saying for the past decade or so, then there's not going to be anything new in there for you, but it's a pretty good crystallization of what he's been talking about.
It includes a relatively basic introduction to Asatru beliefs and practices, a history of the Asatru revival in the US, and some representative starting points for folks wanting to start up their own groups, like a calendar of holidays and a sample blot. I was surprised to see how much of his worldview is still informed by Edred Thorrson's older work, which comes up in a couple of places.
It's pretty diplomatic toward Christianity, as McNallen always has been. He does discuss the fact that Asatru is only for people of European descent, saying also that Asatru cannot survive without us defending ourselves against the present onslaught of immigration and anti-White politices, but he doesn't go on at length about it. Presumably this is also motivated by a desire to remain diplomatic toward a population that are still somewhat unprepared to really embrace and defend their heritage.