What conducts electricity well but heat poorly?

In general, a non-metallic conductor will not be a good conductor of heat. Graphite is an example. There are also electrically conductive polymers
http://en.wikipedia.org/wiki/Conductive_polymer

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diamond is the best for thermal conductivity, but is a very poor electrical conductor.

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http://www.physicssource.ca/

How about salt water. Conducts electricty very well, but depending on the volume takes a long time to heat up and/or cool off.

semi conductors? rubber? glass for sure!