This site provides guidance in setting up a piece of persuasive writing. It covers prewriting, drafting, revising, editing, reviewing, and publishing. Each page provides an explanation of the specific stage of writing being addressed and includes worksheets you can use too!
Alycia Zimmerman's Scholastic "Classroom Solutions" BlogMs. Zimmerman has two blog posts about creative ways to include persuasive writing into the classroom. The first post focuses on students using blogs to make posts "for" and "against" various topics, and the second post focuses on students creating Xtranormal movies to convince people to side with their side of an argument.
This post provides terrific resources for the following persuasive strategies: claim, big names, logos, pathos, ethos, kairos, and research. I like the "Persuasion Is All Around You" handout.