Surfer magazine article with great pictures of surfers in Hammond (Indiana), Chicago (Illinois) and South West Lake Superior.
Absolutely fabulous videos with basic bodyboarding instructions by Tribord. They have 2 playlists: Bodyboard Coaching (english) and Coaching Bodyboard (français). The Duck Dive maneuver is posted twice in the French version, but not in the English one.
Just a search on Bing for "surfing great lakes video".