(I just happen to be a fan of his tribute to the poem Richard Cory.)
The sibl project encourages adult literacy through the vehicle of "songs inspired by literature" Very cool. (While it wouldn't help with literacy, I'd also be interested in seeing an index of artists' homage/reference to other artists...like Nu Shooz referencing Beatles works, or the Beatles incorporating Bach into their harmonies, or (shoot, I can't remember the recent song lyric I heard that was clearly a reference to Pink Floyd's "Wish You Were Here")