I don't share an id with anyone, but I have friends who share an id with their spouses so that they only have to buy songs, apps, movies, & books once, and can

I don't share an id with anyone, but I have friends who share an id with their spouses so that they only have to buy songs, apps, movies, & books once, and can both have access to them on different devices. Today, one such friend spoke of how it's nice for him to be able to snap a picture of their daughter, and have it show up in the photo stream on his wife's phone. So before iCloud it was just a cost-saving measure. After iCloud it's savings plus photo-stream sharing.