Academy of American Poets: (Poetry Archive) The Poetry Archive offers recording of poets (past and contemporary) reading their their poems. The Poetry Archive is searchable by title, author, form and Theme. Its largest organization dedicated specifically to the art of poetry.
Poetry Foundation: Poems, readings, poetry news and the entire 100-year archive of POETRY magazine.
PennSound: Free, downloadable recordings of poets reading their own works or work by other poets. From the University of Pennsylvania.