Radiohead and MTV EXIT have produced a music video for "All I Need," from "In Rainbows" to premiere on MTV globally, May 1, 2008.
From the MTV EXIT website: MTV EXIT is a campaign about freedom -- about our rights as human beings to choose where we live, where we work, who our friends are, and who we love. Most of us take these freedoms for granted, but hundreds of thousands of people throughout the world have had these basic human rights taken away. They are victims of trafficking – modern-day slaves -- and criminals have forced, defrauded, or coerced them into various forms of labor, or prostitution.
Other musicians and creatives have donated songs and time to the cause. You can learn more here.