Room-temperature superconductivity looks like it might be a step closer to becoming a reality. I need to steal some ideas, what technology would you put in a cyberpunk world that makes use of zero-resistance electronics without the need for massive cooling? Super-fast computers? Super-powerful magnets? Maglev? Railguns?
The obvious one would be perfect efficiency transformers(?) so you lose no energy to heat.
Cheap handheld advanced medical scanners like tricorders.