Just watched the channel 4 top 100 and they (or Stephen Fry) had:
a lighter, watch, television, iPod in the top ten...
I guess things like cars, planes and production lines don't count since they consist of multiple gadgets together (but then a swiss army knife was included, so I dunno...)
I'd have thought keys would be up at the top, but I didn't see them. Imagine a world without locks
