Figures of Speech Tables
From a professor at Nipissing University.

Glossary of Poetic Terms
From Bob's Byway.

The Grammar Lady Online
Includes a list of the most common grammar mistakes, reprints of her newspaper columns, message boards, and other interesting features.

Guide to Grammar and Writing
Detailed and thorough instruction on proper sentence structure and word usage.

Outta Ray's Head: The Poetry Page
A collection of lessons and essays about poetry: reading, writing, appreciating, history, etc. Very useful and intelligent despite the silly title.

Poetic Terms
From a professor at the University of Pennsylvania.

Poetry Writing Tips
By John Hewitt for the Writer's Resource Center.