The Open University are running a series of free astronomy courses see links below for more details...
http://openlearn.open.ac.uk/course/view.php?id=3179 Telescopes and Spectrographs
http://openlearn.open.ac.uk/course/view.php?id=2796 Comparing Stars
http://openlearn.open.ac.uk/course/view.php?id=2758 Icy Satellites
http://openlearn.open.ac.uk/course/view.php?id=2382 The Big Bang
http://openlearn.open.ac.uk/course/view.php?id=2453 The Sun
Hope you find them usefull
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