A ?kitchen? where both locals & the less fortunate gather once a month to have a classic meal prepared by volunteers.
A portfolio showcase website where people can donate money, that will then be distributed to all starving talented freelance designers.
A home shower that only works if it senses a person's weight. To keep the temperature stable it would have a thermostat.
Wi-Fi Router that allows you to share 10% of your bandwidth. Create a wireless city without slowing down your connection. #ci
A dock for gaming enthusiasts to iPhone 4. Reminding the old psp and gameboy. Can you imagine playing pokemon yellow on your mobile?
Install rain sensors in traffic lights. Staying red longer when it's raining, pedestrians would have more time to cross the streets.