People in the developing world have cellular handsets but very little money. If you wanted to get information to these people, they are highly unlikely to pay the GPRS/3G costs to access it.
In this project we developed an electronic notice board where the user can download media via Bluetooth (no cost). This solution requires no client software and does not need the user to pair their device with the screen, nor does the screen broadcast spam.
We are currently working with schools, NGOs and government as different information distribution applications.