I took the four parts of Rav Kessin's shiur (see previous post) and combined them into one mp3. The total running time is 1 hr. 50 mins. This is a shiur that will change your outlook and really give you a deeper understanding of what is going on.
http://www.arigoldwag.com/Rav Mendel Kessin on LH.mp3
Again, you can listen to it here, or right click and choose download to copy it to your computer or mp3 player.