I finished (finally) Roland Bainton’s Here I Stand: A Life of Martin Luther. The book was written in 1955, yet remains one of the most noteworthy English biographies of Luther. It is very readable, and is accessible even to someone without prior experience or knowledge of the 16th century reformer. I highly recommend the book.
Though I have a few theological differences with Martin Luther (baptism, church-state relationship, etc.), I find in him someone I can relate to on many levels. His courage is something we all can aspire to, letting our conscience be held captive only to the word of God.