Biographical
Here's a great start page from Stanford University, which includes links to papers, biographies, speeches, articles, and more. It's a great place to start your online research.
http://www.stanford.edu/group/King/index.htm
This page has information about the King National Historical Site, located in Atlanta. What might you learn there that other biographical material doesn't pay much attention to?
http://www.nps.gov/malu/index.html
Cultural
Click here for some info about the HBO movie Boycott. This film deals with the Bus Boycott in Montgomery, Alabama in 1956. Did you see it when it played recently? If you didn't, will you now that you know more about it?
http://us.imdb.com/Title?0255851
In a related bit of information here's a photo of Rosa Parks being fingerprinted for refusing to move to the back of a bus in Montgomery. Describe the photo in as much detail as you can. Why is this such a famous photo?
http://www.americaslibrary.gov/aa/king/aa_king_bus_1_e.html
Bibliographical
Here is a link to an excerpt from "I Have a Dream " in RealAudio. Try to read along if you can. What differs in your reading and Dr. King's? What do you make of the emphasis he places on certain words? What makes him a great speaker?
http://www.hawaii.edu/mauispeech/html/mlkdream.html