Twenty years after it first raised awareness and funds for African famine relief, the Band Aid Trust is active again, preparing to re-record the mother of all benefit projects, "Do They Know It's Christmas?" later this week with Bono of U2; members of Morcheeba, Coldplay, Travis, and Supergrass; Sir Paul McCartney; Dido; Robbie Williams; and Snow Patrol, with guitar power via The Darkness.