I used Creative-Poems from when I was a senior in high school until my junior year of college. It’s a great website – members are very friendly and willing to critique and review your work.
You can cut and paste your poem directly into the editor and there are a number of different formatting options. You can even choose to post an audio recording of yourself reading the poem.
As with most poetry sites, it’s got some of the usual terrible love poetry and infantile rantings, but there are quite a few gems in the mix and many authors who are really serious about their craft.
The reason I stopped using the website had nothing to do with the website itself; I had just decided I would rather not display my poetry online. But if you write poetry or want practice critiquing it, go to Creative-Poems!