[pogo]

I like the idea of using real conversations as opposed to scripted ones but I think that could cause problems for beginners. Even with a transcript I imagine it'd be quite difficult to follow. I also really like the idea of giving users certain things to listen out for.
Have you had a look at mangolanguages.com? They do a similar thing where they have a conversation and then try to break it down. I like how their system works but I don't want to just rip them off.