Here are some resources and ideas to help everyone learn about the life and important contributions of Dr. Martin Luther King.
You can learn a lot from simply watching this video developed by (I think) a 2nd grade class. (Please help me find the original source so that I can properly cite and acknowledge their outstanding work.) You could also do something similar with your students using VoiceThread, Prezi, SlideCast, Flowgram, StoryBlender, or Zentation.
Here are a few more resources:
History of Martin Luther King, Jr. Day – Video from Biography