I've got a system where I download the videos, convert them to mp3, rename them and order them, then burn them to an audio CD and listen to them during my commute. It takes me about 1.5 hours to do this.
I wish there was a button: "CD image to burn mp3's to CD (for CD players that can play mp3)", and "download CD audio image to burn to 80 min CD".
You should build this. I've often wanted to be able to have a button which will bundle OCW materials for offline use. Seems well within the terms of the licence.
