I've been doing the IntroAstro course at Coursera and thought I'd pass on a link from their forums.
Greatest Unsolved Mysteries of the Universe - course 1 of a 4 part series.
Lecture staff are the Nobel prize winning Brian Schmidt and the delightfully colorful Paul Francis.
https://www.edx.org/course/australia...rsity-anu-1347
Looks good
Justin.