Motivating students to learn through editing Wikipedia is not very hard. Here are a few experiences that highlight the value of using Wikipedia as an educational tool, as well as a few tips on specific actions that will fuel their interest even more.
Also view on Wikimedia Commons: http://commons.wikimedia.org/wiki/File:Wikipedia_in_Education_(9_of_12)_Motivating_students.webm
and Vimeo: https://vimeo.com/178647291