Bill Mounce has put together an amazing website that offers Seminary Lectures online for free! You can listen to Dr. Bruce Ware's Systematic Theology class, Dr. Tim Tennet's lectures on Islam and other world religions, Gerald Bray's lectures on Church History, Robert Stein and Craig Blomberg on Acts to Revelation, and more. This is a great resource for those who hunger to have a more in depth understanding of the Christian faith. The amazing thing about this is it is all free! I personally have found this site to be a huge blessing. If you are looking for a great place to start listening may I suggest either Dr. Ware's Systematic Theology or Dr. Tennet's lectures on Islam.