I found this article
from the great blog Paleofuture
to be really intriguing and interesting.
I was particularly struck by the number of designs for remote learning through technology over the past hundred years. What struck me more than anything was our myopic view of what is "disruptive" in education. Just look at the radio book, and then compare it to the almost daily press reports about the role that tablets will play in schools.
It's a good reminder that knowing about the past, particularly in educational technology, needs to be a critical part of our work.