After more than 3 years of procrastination, the CRTC has approved HDNet. Speculation is the timing corresponds to the CRTC response to the lack of effort for HD by Canada's broadcasters.
http://www.crtc.gc.ca/archive/ENG/Notices/2006/pb2006-75.htm
http://www.crtc.gc.ca/archive/ENG/Notices/2006/pb2006-75.htm