I recently discovered university courses on-line free at Itunes U. For an introduction for go to
There are video and audio courses from some of the best universities in the world. You can watch professors from Harvard, Columbia, Oxford, Cambridge, Stanford, and many other places give undergraduate and graduate courses. You do not get credit for the course but you sure can expand your knowledge. Some of the content is more impressive than others but every single site delivers value.
They also have demonstrations for many schools in the K-12 range about new ideas on how to teach subjects. One I looked at showed Grade 4 kids going for a walk everyday with a pedometer. Then keeping track of their progress using Excel. The ideas presented really stimulate your imagination. Another showed a grade 12 biology class teaching grade 5 about cell biology.
Great find! Have a look. I have been wondering about the business model that makes people publish to the site. I suspect it is another way to promote your courses and also make them available to your students for review.