This week I finished listening and taking notes on the course called "The Church and the World" from Reformed Theological Seminary.
The professor of the course, Dr. W. Andrew Hoffecker, provides a detailed description of the changes in theology from the 18th century to the present.
The best lectures for me were the ones at the end of the course that focused on more recent events and trends: Evangelicalism (2 lectures) and Culture Wars (5 lectures).
The school has also posted these lectures on iTunes U for free. I recommend them.