I kind of briefly mentioned this before, but I thought I would dedicate a post to it.
Natasha over at Maw Books is hosting a huge contest in the hopes of raising both funds and awareness for the people of Darfur. She includes links and videos with information about what is happening over there.
It looks like there will be some great prizes, including some signed books by various authors, and it's pretty easy to enter. You can read all about it here.