The Atonement of Jesus by R.C. Sproul

Ten lessons on the Atonement of Jesus.
http://www.ligonier.org/learn/series/atonement_of_jesus/?filter=free&page_series_list=2

1. The Symbol of the Cross
2. The Necessity of the Cross
3. Why the God-Man?
4. The Meaning of the Cross
5. The Substitute
6. A Ransom Paid
7. The Redeemer
8. The Curse of the Cross
9. For Whom Did Christ Die?
10. Questions and Answers