One resource that I learned of earlier this year that has definitely expanded my horizons in understanding God's Law is R.J. Rushdoony's audio series on the Ten Commandments that can be streamed online at www.PocketCollege.com.
This is an exhaustive study on the commandments themselves and associated laws. They were recorded in the late 1960s so the audio at times is not the greatest but I found the majority of them to be listenable and definitely worth the time investment. Most of the actual lectures are 20-25 minutes with question and answer periods that can extend anywhere from 10-30 minutes...the Q&A is also very helpful although at times it can be difficult to hear the question since they only had one microphone.
If you think that you may be interested I would highly recommend checking the first two introductory lectures out and then making a decision on whether you want to listen to the next 117 lectures.