The CRTC has setup a web site to consult the public about throttling. There is even a youtube video from the CRTC... I know you're thinking "the CRTC knows about YouTube?!", but it's for real:

http://isppractices.econsultation.ca/

There is even a place to post comments.

Press Release: http://crtc.gc.ca/eng/news/releases/2009/r090331.htm

If you haven't already made your thoughts known to the CRTC, now is your chance.