I mentioned in one of my lectures, a book by Andrew Finch of Kyungpook Nat. Univ. in Daegu -- Visit Korea! A great book for using a Korean cultural focus in class for learning / teaching English. Students really get motivated when you use a lot of "Korean" content. Take a look at his book page. I've also attached some of the books in .pdf for your quick use. The tasks to supplement the High School textbook is excellent!
I've done a few workshops with Andrew and I love his philosophy. Here is a video he produced which might give you some thought about your own classroom situation.
And some other books to help and which might be useful for general teaching. Further, all teachers should see the Media Fire account at EFL Classroom 2.0. There , you will find a folder called ESSENTIALS. It has all the ppts etc...for teaching any topic/subject. A real necessary thing. Here is a direct link / permission to the mediafire folder but please visit us at EFL Classroom 2.0.