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Language. Everything we have today is dependent on it. Without it, we wouldn't have gotten this far.
I agree it's important, but not because it helped us to get to where we are today, because I don't think where we are today is as much of an improvement over where we're coming from as some people think.
I say language because it's important in order to have complex ideas, but that isn't to say that our abilities have been used in the 'best' way. I think I value it more because of what it has the potential to accomplish.
The wheel. Without it there would be no unicycle, bicycle, tricycle, motorbike, motorcycle, car, truck, wheelbarrow, Segway, the list goes on and on....
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But electricity is required so ...so many things dependent on each other. 
