I'm a developer at Khan Academy (currently working on the upcoming Android app), and it's cool to see that there's real interest in that kind of use case! In our hackathon a few weeks ago I wrote an audio-only Khan Academy app that lets you listen to any video or the text-to-speech of any article and is controlled completely through voice commands. Unfortunately it's not quite at a point where other people can use it, but maybe I'll take the time to actually productionize it. :-)

Here's the code if you're curious:

https://github.com/alangpierce/Audicademy

And there's a feature-incomplete web version that lets you navigate to any video and play it (requires a recent version of Chrome):

https://audicademy.appspot.com

Interesting I've been doing podcasts during my drives but never thought about Khan Academy. You can get away with not seeing anything they put on the screen or draw on a whiteboard? Have you had success with just listening to all the courses?

Hey. Is there a way to extract the audio so I can listen to it from my phone? The links above point to flash content that I can't access on mobile