John Piper on Justification and the Work of Christ
The audio and manuscript of John Piper's Crossway Lecture at the 2007 Evangelical Theological Society has been made available. His lecture is an outstanding introduction to his most recent book, The Future of Justification: A Response to N.T. Wright.
Incidentally, I have also written a bit on law-gospel themes from Rom. 9:30-10:13 in a six-part series beginning with this post.