I spend a fair bit of time each week either in my car or on a piece of exercise equipment where I can listen to sermons and lectures that are good for the edification of my soul. If you likewise are interested in adding some beneficial sermons to your iPod, you might consider the audio collections at both the Gospel Coalition and Monergism. Both sites have thousands of sermons available, and doubtless you will find much there to help you.
Words of Grace 