It seems that only one album could be shared at a time, so it's boring to deal with lots of albums. It's better to add the albums under one category and share the whole category to friends, but I can't find this feature yet.
While it is already possible to organize your Albums into Categories, you cannot share Album Categories. How should such sharing be implemented? Would it send a single email with a list of links for each of the Albums? Should we create a new sort of page in your home page that acts like your full Gallery but only lists some albums and have the link go there? Did you have other ideas on how this would work?