It will be interesting to see where pricing for the Presto photo printing service comes in. I think annual subscriptions are easier to swallow than monthly ones, particularly if a device is going to need consumables like the inkjet "photo mailbox" that Presto is planning. Presto is reminiscent of several previous attempts to entertain the lightly connected elderly or technophobes — WebTV, Cidco's MailStation and Ceiva, which still seems to be kicking around. Presto, though, seems like a product that is more attuned to its target demographic than Ceiva.
Presto's solution doesn't use the Internet, though, which leads me to believe that's using some kind of wireless network, which would be challenging to implement cost-effectively.