These are officially on my holiday wish list
finally available [just today] Coffee Joulies. What are they I can here you say? from the site:
Tired of burning your tongue on coffee only to have it get cold a few minutes later? With the Coffee Joulies™ Gift Pack your coffee will be ready to drink in minutes and will stay that way for hours. Each polished stainless steel shell is filled with a special phase change material that melts at 140°F. Put them inside the custom-printed thermos and they absorb heat from your coffee when it is too hot and release it back into your coffee to keep it at the perfect temperature.
available for $100 for the set Wonder if one pack would cover two people's coffee?