I've created a visual Essay Writing Primer or Refresher using the free online presentation tool, Prezi, to share with all of you. Have a look at the "Writing Assignment Primer: A Refresher for Writing in the Disciplines" Prezi by clicking here. Just click the right and left arrows underneath the slides to move backward or forward through the presentation.
If you're interested in creating your own Prezi, let me know. I'd be glad to walk you through the process of creating your own student account and composing your own presentation with this tool. Their slideshows are more dynamic, in terms of transitions and slide design, than those you can create in Microsoft PowerPoint, I think.