Adding to the canon
Ron, my uncle, has suggested a reading list - really a curicumlum - of "New American Poetry," "that phenomenal mid-century confluence of poets who changed the writing of the U.S." If you have any interest in 20th century, American or avant and post-avant garde poetry (or, as I do, an interest in poetics and aesthetics esp. as influenced by poststructualism etc.) I suggest a look at his list, which includes Zukofsky, Duncan, Creeley, Ashbery and Spicer.
(Note: Valerie, if you see either New American Story or The Poetics of the New American Poetry at Powells at reasonable prices, pick them up for me.)