Sacred Text Archive
"Stories From the Faerie Queene" by Mary Macleod
This is a Victorian era retelling of Edmund Spenser's "Faerie Queen." Useful for getting a grip on the plot, or for comparison of language.
Virtual Salt
Virtual Salt: A Glossary of Literary Terms
This site provides a long list of literary terms complete with full definitions and examples.
Other
So You wanna.com: So You Wanna Learn About Poetic Form?
Discusses poetic form and the basic unit of form, the stanza. Also defines many related terms including couplet, triplet (tercets), quatrain, sesten (sestina), rhyme royal, ottava rima, Spenserian stanza, sonnet, and villanelle.
Other
Bob's Byway: Glossary of Poetic Terms
Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.