I have been studying RTK (Remembering the Kanji) so I’m not to aware of the recently added capabilities Skritter has for audio. Do you have full spoken sentences? Does it have to be with text?
I noticed http://www.japaneseaudiolessons.com/ has free audio lessons and more content than any other pure audio program that I am aware of. I haven’t used the program yet but I was thinking it might be good if it could be used with Skritter’s current spaced repetition system. What do you think?
What initially caught my attention was it’s approach to teaching grammar. It is one of the most difficult things for me to get comfortable with when using Japanese. I know it probably won’t happen but it would be great if in the future Skritter could somehow group the sentences based on grammar. Then have the sentences in the groups served to the user using spaced repetition based off grammar.