We just watched Luther the movie at our Emmaus Christmas Party.
If your appetite is whetted for more of Luther and his boldness, you may be interested in this short book by Michael Reeves. I could not put this book down the first time I read it. It is a witty yet purposed study of the Reformation. The biographical sketches of Luther, Calvin, and Zwingli are spunky, engaging and open up your courage for Christ.
If you want to light a fire in your heart for bold proclamation of the gospel, here is a good log for fuel.
The Unquenchable Flame by Michael Reeves.