A site I can’t plug enough is the Open Education Resources site at www.oercommons.org. I always recommend this to teachers working in developing countries. Potentially this site can be of tremendous help for informal learning as well.
From their website: ‘OER Commons is the first comprehensive open learning network where teachers and professors (from pre-K to graduate school) can access their colleagues’ course materials, share their own, and collaborate on affecting today’s classrooms. It uses Web 2.0 features (tags, ratings, comments, reviews, and social networking) to create an online experience that engages educators in sharing their best teaching and learning practices.’
‘Open Education Resources (OER) are teaching and learning materials that are freely available online for everyone to use, whether you are an instructor, student, or self-learner. Examples of OER include: full courses, course modules, syllabi, lectures, homework assignments, quizzes, lab and classroom activities, pedagogical materials, games, simulations, and many more resources contained in digital media collections from around the world.’