As a Canadian myself I am quite interested in Project Gutenberg Canada, and if I ever get free time (not in the forseeable future, anyway) that’s where I would be likely to volunteer my help.
Having just learned Australia has followed England into being bullied to up their copyright terms from Life +50 to Life +70 I am frankly amazed (and terribly pleased) that Canada has not. Perhaps the nearly universal opposition to same in our Copyright Consultation made some little impact after all.
Still, in my online efforts to plug the Public Domain and fight against copyfraud, I don’t tag things I know are PD in Canada but bnot elsewhere as “Public Domain” because first and foremost I don’t want anyone to find themselves DMCAed, fined, or winding up in jail (or worse) through the brutal application of today’s crazy copyright law.
I thoroughly agree with your policy of re-releasing improved Public Domain works back into the Public Domain. I do that too, although so far I’ve not remade any eBooks, just art), and I guess what surprises me the most is how many people don’t.