I was looking for some open source courseware, and my Google search brought up this site from the Massachusetts Institute of Technology. They already have materials from 1,800 courses online. Have a look at the home page for the introductory Genetics course, for example.

This isn’t a distance learning site and there are no fees involved; you can self-pace yourself through the materials for whatever courses you like here. This looks to be a great resource for students and educators everywhere. It does cost them to do this, and they do solicit donations to help make this happen.