http://www.amazon.co.jp/日本人の知らない日本語-蛇蔵-海野凪子/dp/4840126739
The English title is Japanese that Japanese people don't know, and I have bought both books at a local bookstore. This book is about a Japanese teacher trying to teach Japanese to foreign students. I'd say the book would be good for people in the intermediate level at least since there are a lot of kanji.
I've started the first book, and have had some good laughs at all the mistakes the students have made.
I'm really curious to see how the TV show will turn out too 
