My only recommendation, and nothing I can dig a star about as I'm not sure how to address it, and it may go against another review I saw that complained about the toy soliciting attention (something they turned off), but the kids don't know when a new message has come in unless they are around the toy when the message comes in. It makes a noise, once, when a new message comes in, but if they are away from the toy, then - say at school... Well, they really have no idea they have a new message from dad waiting unless they go and push the button. Though thinking about this, I'm not sure if I would want it making a noise or something continuously beaconing "I've got mail??",... My plan is just to have them press the button when I'm away from time to time.
Super cool, innovative, and it also looks as though they will be building in more features as time goes on. (Connecting to different WiFi networks automatically would be nice... So if they toy goes from home to grandma's it still works, without Grandma having to understand what a WEP key is :) )