Just finished Interstellar Age by Jim Bell (An Arizona State professor!). Pretty good book about the Voyager program. I would have preferred a little more on the discoveries and the development process of the spacecraft, but I get it, this is for mass consumption.
Having said that, I do think that the Voyager program may be the most important single project in human history since Columbus’ voyage to Hispanola. In a similar way, Voyager doubled the size of our universe by actually visiting our solar system’s outer planets.