One of my absolute favorite websites is Camelot Project. Dedicated to Arthurian literature and art, it contains many e-texts of Arthurian literature, especially medieval texts and poetry from the Victorian era. There are also links to TEAMS Medieval Texts and Robin Hood lays. Because they are e-texts, I am able to download the medieval texts, render them into modern English spelling and read share them with my kids.
Many of the poems have been anthologized in an excellent series entitled "Arthurian Poets." Featured poets include Matthew Arnold and William Morris (together in a single volume), Charles Williams, John Masefield, Algernon Charles Swinburne and Edwin Arlington Robinson.