I received 2 comments on my last post! Thanks :-)
Have you heard about the new headphones that you listen to through your skull? It's called Bone Conduction Headphone.
I am really interested in trying this out. If it does not make your ears tired, it would probably be good for language learning. I would put one lesson on repeat and listen to it for 10 hours a day. It would be passive listening but it should sink in pretty well.
I like to try before I buy, so I might have to go to Akihabara this weekend to try it out. Although, I'm afraid I might like it and then I'd have to part with my money!