I recently found a very useful website for electronic Biblical Resources. It is ‘housed’ at Gordon College (where I used to work part-time in the mail room while studying at Gordon-Conwell) by Ted Hildebrandt:
What is relevant for this website is the info on Song of Songs. He has a couple of articles posted, but more important, he has posted 4 audio lectures of Dr. Lloyd Carr. Dr. Carr was a professor at Gordon (I assume he is retired) and wrote a very valuable commentary on Song of Songs in the Tyndalle series.
I hope that you will enjoy his lectures. I have not had the time to listen to them yet, but I read most of his book :):)
This post also appears at http://www.songofsongs.wordpress.com