The icing branch at NASA’s Glenn Research Center has developed a number of in-flight icing education and training aids for pilots and operators alike, including this hour long video. And while the “actors” recreating the icing incidents in the video will probably not win any Academy Awards for their acting abilities, this is probably the best video you will find that is intended for general aviation pilots about icing.
[youtube=http://www.youtube.com/watch?v=j_D8tcnL2uQ&w=480]