NanaGram works best for people with siblings or cousins who want to send a curated pack of photos to their loved ones. The account owner can invite people to send in photos and everyone can tailor reminders (1 week, 3 days, 3 hours, etc from the monthly ship date).
The other nice thing is the interface, since most of the time there isn't one. We give you a unique phone number and all you have to do is text your photos to the number.
I'm hoping to release a couple low-priced solo-sender plans soon.