I just finished uploading a conference that Dr Joseph Pipa and Dr. Richard Gaffin, Jr. participated in back in 1998. The theme of the conference was Reformed Hermeneutics and Homiletics. Those interested in preaching and the various issues in homiletics such as the redemptive-historical approach, this audio will be of interest to you.
Richard Gaffin has been a professor at WTS since1965 and is the author of numerous articles and books including Resurrection and Redemption: A Study in Paul’s Soteriology and By Faith, and Not by Sight: Paul and the Order of Salvation.
You can also listen to some of his courses from WTS such as The Canon or The Theology of Hebrews by signing up here.
Of course, you should not forget Dr. White’s own contribution to homiletics in his Pulpit Crimes: The Criminal Mishandling of God’s Word.
Update: You can read Richard Gaffin’s essay The Glory of God in Paul’s Epistles in the latest edition of Theology in Community The Glory of God.