At Canaan's Edge: America in the King Years, 1965-68 by Taylor Branch

This is part three in a three volume biography about Martin Luther King, Jr. I wish I had time to go back and read the first two volumes before reading this but even without reading them this solid work will stand on it's own in chronicaling the last few years of King's life and how these events shaped the civil rights movement. Particularly engrossing were the descriptions of the marches and the author did a good job of capturing the mood and tension of the moment. I especially liked picking out details about many of the early civil rights leaders still around and active in today's political landscape.