This video of Nokia's Jan Chipchase is one of those videos that I come back to over and over again. It truly changed the way I look at technology's implications on the global community.
Jan spends his time traveling the world and doing ethnographic research to figure out how the mobile phone fits (and will fit in the future) into our culture. This local, first-person research is so valuable and has very wide-reaching implications.
The coolest part is when Jan goes into the way that phones are used in Uganda as ATMs. People basically exchange airtime minutes as currency. There is a central point person in the local village who has a phone and who exchanges minutes into cash. In other parts of the world there is a whole industry created around supporting and repairing devices where those services do not exist. Other countries are using mobile phone numbers above the entrance to houses instead of house numbers. That's their identity.
Check it out: