Here is a set of good links on cell phone usage in Africa. Lots of implications for how we might use digital technology to reach the African continent.
In War-Torn Congo, Going Wireless To Reach Home
The Amazing Growth of Mobile Tech in Africa
Forget the $100 PC
Phones Teach Written Literacy
I came across all of these links by following one link from Robert Scoble.

I believe that the internet provides today's church with a historic opportunity .... to tell the old, old story of Jesus and His love in ways which could only have been imagined in times past. The objective of this website is to explore the various ways in which today's technology can be used to spread the gospel around the world.
