I realize that PBS is only for US residents. I can see how it would be tricky having other countries join in....what about having a PBS Canada?

Canada has a strange postal system.  It costs a different amount to mail to different areas, even for a regular letter.  It is very expensive as well.  Sometimes it is cheaper for a Canadian to send to the US than to another place in Canada.

I think it's been mentioned that until they improve their postal system it won't happen.  I do Bookmooch as well as PBS and on many of the Canadian members profiles it says they will mail to the US but not other Canadians because it's so expensive to mail books within Canada.