The following video clip was uploaded to Youtube in 2008 (same year as AU PoliSci Mcast).

http://www.youtube.com/watch?v=Twk8GVRvJnk

The major differences between the two are the video resolution and style.  The AU PoliSci has a maximum resolution of 360p, whereas the Chemistry Lab Safety Video from Athabasca University was only 240p.  The Au PoliSci Mcast is a complete self-contained program with beginning and ending segments, while the Chemistry Lab Safety is a video clip focused on engaging manipulatives.