Interesting answers folks!!
Lots I hadn't thought about.
The obvious thing for me would be knowledge - how to meet needs not greeds. And a laptop+electricity source would be a good way of storing hundreds of books. In terms of technology - its difficult as ideally we leave behind stuff we dont really need and as someone mentioned we dont want to keep the stuff that got us in this mess in the first place.
There's a good thread:
Appliances: the necessary, the optional, and the execrable.
which recommends washing machines etc I suppose it depends on what level we might collapse to. Most things we could make - or figure out how to make so long as we still have tools or the ability to make tools.
In a post total collapse thing then the following professions might acquire almost shamanic respect : dentists, midwives, herbalists, blacksmiths. Extremely valued would be all the skills you see in a self -sufficiency book - like basket making, bodging, gardening, tanning, weaving etc etc.
Conflict resolution might be handy!
I was also wondering about such as: the justice system or democracy,
although these things could easily be recreated after a fashion (and perhaps made better).
How about clocks and navigation?
I have survival- and self-sufficiency skills so its easy to say this - but I dont think we need be afraid of nature. Survival sounds like hard work, and a riposte to the environmentalists is often 'What? You want us to return to the stone age?' To me there's a big difference between 'standard of living' and 'quality of life' - People living simply smile more - there's something important going on there!
It is often said that modern man is separated from nature leading to fear of nature, leading to abuse of nature, leading to separation... This is undeniably true - but there's hope. I worked in the jungles in Bolivia for a while - staying with an american woman and her three teenage daughters. She was quite a hardened hippy (a midwife who had delivered her third child on her own by the side of the road somewhere in the desert). Anyway her three kids were not hard - she had whisked them away from their father (from LA I think) and plonked them in the jungle. It was hell for them - they missed burgers, makeup, tv, boys etc... The youngest was 14 and separated by a few years from the other two - it was hardest for her as she was somehow always winding them up and they would stick together to fight her - often physically - and always it seemed to be her fault. As a result of this she sought her space in the jungle, whereas the other two never left the compound. I felt some affinity towards her and we made friends - she showed me her world - the jungle. I was amazed! In only a few months she had learnt so much - she had named
hundreds of plants and animals and discovered many of their properties. For example there was a solitary ant she pointed out as the 'hurts-for-three-days-ant' - the locals call it a 'burro' because its bite is like being kicked by a horse! So all this is to say that alot of our survival skills may not be burried that deeply. To me this is about empathy and awareness. Alot of it is probably hardwired - like nest building and foraging. Afterall we've only been out of the jungle for a few thousand years - nothing compared to the millions of years we've spent evolving there. I wondered though if it gets harder to learn as you get older - her other sisters were afraid of the jungle and couldn't engage with it at all.