http://www.google.com/edu/teachers/lesson-plan-search.html

Google has shared quite a large collection of lesson plans that focus on either their products or use their products as part of the learning and which are available for free and applicable across a wide range of age groups.

http://www.k12opened.com/blog/archives/517

While perhaps focused on K-12, these open licensed media sets may prove very helpful to educators in post-secondary as well. They cover a wide range of subject areas, from Ancient Egypt to Civil disobedience.