I would like to be able to give out a URL to a gallery that would not allow guests to hyperlink to my other galleries. IE I want some people to see everything and some people to see just one gallery. I could just make all my galleries non-public but I'd like some people to be able to browse all galleries.
One solution to this might be password-protected galleries, a new feature that we are working on. This will enable you to assign passwords to certain galleries. So, only people who know the password can view those photos. Of course, this feature is in its early stages. So, it will be a while before it is up.