FindPoetry.com A good and growing classified and annotated "Link Central" to poetry sites on the web.
Symbolism in Poetry. A useful discussion at Answers.com. Thanks to Ms. Collins' Girl Scouts in Denver for suggesting this link.
The Wondering Minstrels My favorite poetry site when it was active is still online, though new poems don't seem to be added any longer. This neat and unpretentious site, created by Martin DeMello and Sitaram Iyer, featured a new poem each day, drawing from the entire history of English language poetry (and English translations). Insightful commentary usually accompany the poems. Fortunately the poems are still available, though some features of the site are dead.