I was out recently with a guy that loved his GPS and watched it constantly, but couldn't read a topo map, and it got me thinking about how reliant we are on technology.

If your computer, PDA, Blackberry, iPhone, GPS, graphing calculator, internet, etc. went down, could you identify these items, much less USE them?
Lost Skills

What else would you "need" that doesn't use an external power source, or integrated circuit?

(Sorry, haven't figured out how to get the image in here)