Invitr is a Flickr related application that lets you share your friends/family/private Flickr photos with non-Flickr members.

You can specify one or more private pictures to be shown to as many people as you want. It’s kind of the only feature missing in Flickr. Think of an extension of the Public, Friends, Family and Private status.

You can also set expiry dates for the pictures you have shared and so after that date has passed, the person will not be able to see it. The invited people also cannot comment on the image, only view it.