I am a public school teacher here in Kyeongsangnam province and also a Korean Director of Sales for a website called Truespokenenglish.com. The purpose of the site is to help non-native speakers the secrets to speaking English naturally.
Here is a link about how the website can help teachers.http://www.truespokenenglish.com/index.php?option=com_content&view=article&id=260&Itemid=332
If you are interested in a free week-long trial of the website to see if it is useful, send me a message here
or you can send me an email at justin (at) truespokenenglish.com and I will hook you up.