What James said: there are enough tricky parts with the Canadian
situation that I think the project would need some kind of
institutional support, or at least stable funding. The $5 federal fee
is a pain, and in general -- I'm not too familiar with the different
rules in each province -- requests need to be sent on paper and you
can't require that responses come via e-mail.
But, yeah, I'd love to see this happen too (and have had chats with a
few people about it, but have no current plans to build anything). I
know visiblegovernment.ca spent a while looking into it a few years
ago too.