This month's free audio book download from Christianaudio.com is The Best of Jonathan Edwards Sermons.
Here's the description of the three sermons included:
The Jonathan Edwards trilogy includes three of the most important sermons ever preached on American soil. Sinners in the Hands of an Angry God is maybe the most important and well-known sermon of his, but also included is A Divine and Supernatural Light describing and illuminating what Edwards describes as a supernatural light imparted by God. His farewell sermon was given in June of 1750 and is a commendation to those who are in the Lord's service, a plea to maintain unity, avoid dissension and false doctrine, and a call to devote themselves to prayer.
Each month, they feature a new free audio book along with numerous other free downloads--lectures, sermons, and interviews with authors. Because of the wide variety of books they carry, I can't say that I endorse everything there, but keep checking back for interesting free books and other selections like the Veritas Forum lectures.