Open Yale Courses is an open source provider of free and open access to a variety of introductory courses at Yale University. Science selections include:

• Astronomy
• Biomedical Engineering
• Chemistry
• Ecology
• Environmental Science
• Molecular, Cellular, and Developmental Biology

The course provides a syllabus, audio and or video of lectures, link to books used, downloads, and some even provide access to online study groups.

I can imagine these being useful to advanced science learners and even as a source of review or professional development for secondary science teachers.

The content is also available through iTunes and YouTube. See an introduction to Physics 200 below: