Thank you for your help. I agree that the information in the URL is not always enough. I am glad it started a discussion and I hope pg reads the rebuttals to what I wrote. (github.com) is a good example. It shows why github was so eager to move gh-pages to github.io

Perhaps a way to get around the ambiguity (at least in case of github) would be to encourage people to use/link to gh-pages (so we see github.io as distinct from github.com) when they are available?