Wayne Grudem’s entire Christian Essentials class is now on iTunes. This is five years of lectures going through his excellent Systematic Theology book.
I’ve recommended this book more than any other book. It truly is a helpful work that is accessible, easy to read, and thorough.
Faith by Hearing 
Thank you for this resource! I’ve had this book for about 6 months, and find it VERY useful. This will only further it’s impact on me.
Actually, all the messages are available free here: http://www.christianessentialssbc.com/messages