I really enjoyed this podcast from the Keck Observatory podcast page, given by Dr Imke de Pater.
It talks about the formation of rings (dusty and icy) around Jupiter, Saturn and Uranus - and how the edge on ring crossing reveals more clues. There's an upcoming edge on ring crossing of Uranus' rings later this year.
Well worth a listen/read if you like planetary science.
MP3
PDF
Enjoy.