This site, operated by the University of Illinois at Urbana-Champaign, is an online companion to the eponymous Oxford University Press textbook. It consists primarily of critical essays, but there is also a sampling of poetry from over 150 poets, and some biographical information. One of my favorite sections of the site is for Dorothy Parker. Be sure to click on the Gallery link on her page, and check out the additional poems as well. A decent selection.