Martin Luther King Jr - Happy Birthday!
It's not celebrated outside the US, but there aren't many people who haven't heard of Martin Luther King, Jr.
He's a leader if there ever was one - unafraid to live his beliefs at the risk of his life and those of his family.
I don't know all that much about King save the stuff most other people know - thankfully Black Civil Rights was part of our history curriculum - so I'll post some links to some more insightful stuff I've come across recently.
Martin Luther King, Birmingham, and the great letter
The Prophetic Voice
The content of our character - King's dream and ours
The Martin Luther King, Jr Papers Project (have your speakers turned up)
Wikipedia's list of further links