I don't know how many of you enjoy science historian James Burke but, you should deffinitely watch "Technology traps" from the first episode of the original 1978 Connections telivision series. You can find it on Youtube.
Mr. Burke begins with the Blackout of '65 and asks the audience some very thought provoking questions about what survival would look like without modern technology. Anyone know how to yoke oxen to a plow?
If you're hooked, check out Connections2 (1994) and 3 (1997).