After all, why stop writing at the end of November? Print off the free PDF Writer's workbooks (available in elementary, middle school and high school levels) and conduct mini-lessons on a variety of literary elements, including the "plot roller coaster," character development, conflict, setting, mood, dialogue, and using sensory details. These workbooks are incredibly versatile, and would work well with literature circles, classroom novel studies, or student writing assignments.
NaNoWriMo also includes exercises for work shopping student writing--peer review and self-review--as well as grammar checklists, and guidelines for writing a letter to an editor. Another feature that I like about the writing workbooks is that they strongly link the acts of reading and writing, asking students to reflect on positive reading experiences that they have had in order to inspire their own writing.