I recently saw Ken Banks present at a local speaker series run by IREX. He gave an updated version of this presentation from POPTech, on the power of mobile phones in citizen empowerment, NGO communication, and a host of other amazing stories of using the available, appropriate technology in remote and rural locations which are often off-grid and without Internet access. By attaching a computer (Linux, Mac, or Windows) to a cell phone with a data cable and installing his (free, open source) software, FrontlineSMS, that computer is turned into a messaging hub; sending and receiving text messages via the cell phone to hundreds of contacts.
That's pretty amazing. Three reasonably available pieces of hardware and you have a tool to send alert messages out, receive election monitoring information through, or communicate with field medical workers to coordinate and track supplies and treatment information. Or track corruption. Or report human rights violations. Or share news and tips in places where the media is not independent, as one of the FrontlineSMS success stories shows: