An Academy Award-nominated actor and a renowned human rights activist team up to change the tragic course of history in the Sudan--with readers' help.

While Don Cheadle was filming Hotel Rwanda, a new crisis had already erupted in Darfur, in nearby Sudan. In September 2004, then-Secretary of State Colin Powell termed the atrocities being committed there "genocide"--and yet two years later things have only gotten worse. 3.5 million Sudanese are going hungry, 2.5 million have been displaced by violence, and 400,000 have died in Darfur to date.

Both...