You can also take the demo course on edX.org to see some of the capabilities of the platform.
https://www.edx.org/course/demox-edx-demox-1
And this edX 101 course explains how to author a course on the edX platform:
https://www.edx.org/course/overview-creating-edx-course-edx-edx101
Stanford’s description of Open edX
http://online.stanford.edu/openedx
BerkeleyX wiki