Here is a site for Model Lesson plans with links to follow and so on. I found it useful. K-12th. http://www.history.ctaponline.org/center/
Here is another one http://www.col-ed.org/cur/#sst1
Here is one for AMERICAN HISTORY http://ericir.syr.edu/Virtual/Lessons/crossroads/ this one has the grades modified out
I think this has been mentioned before but here it is http://school.discoveryeducation.com/lessonplans/index.html