So this video below (been watching a lot today) is interesting as it talks about an Open Source Learning initiative. In it, Richard Baraniuk talks through Connexions, an online, open source education system which is written collaboratively; edited, mixed and built upon by many people. It could be described as a wikipedia for teaching, but controlled more vigorously by trusted and knowledgeable vetters. Below is a pretty diagram of the system from their site.
The idea is to collaboratively combine knowledge from a huge range of subject areas and provide a modular teaching environment. Making it modular makes it easier for information to be added and updated.
Baraniuk describes it like "Allowing books in the library to talk to each other."