Helium.com is another good site for poetry, as well as many other types of writing--including short stories
and
articles of almost every description. While they offer no up-front payment for your work, they do have a revenue-sharing system in place, which provides writers with (very) modest monetary rewards for work appearing on the site, based on number of page views received, as well as peer
rankings of each piece within its particular category. (Realistically speaking, you can expect to rack up small change, as your works remain on the site after posting--though, in time, and with enough popular postings, this could probably grow somewhat.)
Comparative peer review (which places two articles/poems/stories side by side for ranking by other
Helium members) is the mechanism by which the best works rise to the top. As with many other websites that post your writing, you will need to join Helium in order to publish your work there--but membership is free.
Helium is a good, solid site where you can watch your ratings evolve, as your works are continuously rated against others within their categories--and where, hopefully, you'll be able to sit back, relax, and watch your articles' rankings rise steadily--along with your profits!