I want to share photos with family and friends who do not necessarily have Google+ accounts.
In Picasa I could save photos as Private so they just needed the Private Link.
But I don't see that option in Google+.
When viewing a Google+ album, click on "shared X" and you will get a lightbox where you can either directly enter email addresses of those without G+ accounts. They will get emails to view the album. Or you can use a direct link.