Multiplication of the Early Church--Early N. Africa History
Fascinating testimonies of Perpetua and Felicity, Christian female martyrs at the beginning of the 3rd century. It also has some good tips on how to win new believers in the 21st century.
I enjoy his talks because he's just so natural and down to earth. I was only going to watch 10-15 minutes and then come back and finish this some other day, but I couldn't stop till it was over.