There are some good river rescue and safety videos specifically for paddlers on the Canoe and Kayak site, the series just got an award from the National Association of Search and Rescue.  Obviously the not same as taking a multi-day course but really worthwhile information in the ones I've watched so far.

At the bottom of the page linked to below are links to episodes 2 through 10 so far (more to come, it seems):

http://www.canoekayak.com/skills/rescue-for-river-runners-recognized/

And #1 which is not linked to on that page is here:

http://www.canoekayak.com/canoe/rescue-for-river-runners/

The people that made the videos do courses as well, mostly in eastern Canada - although the 'elite' class is in Costa Rica this year:

http://www.rescueforriverrunners.com/

Most of the videos are on that site as well but only Canoe and Kayak has the most recent one (#10) right now.