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I listen to lectures on my way to and from work every day. I connect my iPod touch to an FM transmitter gizmo
in my car. Later in the evening I review the lesson in the booklet that comes with the CD.
I discovered a great trick when I transferred audio files from the CD into iTunes. A single 40 minute lecture might consist of as many as 6 audio files. In the iTunes Advanced menu tab there is an option to Join CD Tracks. Before ripping the CD, I simply highlight the appropriate audio files and click Join CD Tracks. This approach greatly reduces the clutter of too many files, and makes sure I listen to a lecture without interruption.