I have no idea if it has been done before, because there is now so many lessons that I haven't lissen to all of them.
Well, I would like a Survival Phrases about going to the Ueno Zoo (or any other Zoo).
Of course, you can survive in Japan without this, but it would be nice to have a small lesson about it: you could introduce a lot of vocabulary about animals in there (elephant, giraf, monkey and son on).
I think it's usefull for our japanese knowledge to know how these animals are named...
Well, it's just an idea anyway. Keep the good work.