Just noticed all the gadgets are W today. Including the previous Watch using laser.
I have heard of Wifi Weighing machine but not seen one in Asia yet. These can either connect to the iphone or to tweeter and straight away tweet your weight. Could be useful for devices like blood pressure, heart rate and weight for parents. Set it up for them, teach them how to use or stand on it and the children or doctors can follow the tweet to see their status.
The wall of sound ipod speaker might also come in handy for parents who are a little hard of hearing.