AnyTemp Coffee Dispenser

Basically, have a coffeemaker which brews coffee, and puts it into two internal reserviors. One reservoir is kept at the hottest temperature that any sane person might drink coffee, while the other is unheated -- possibly even refrigerated, to the lowest temperature that any sane person might drink coffee. (If refrigeration is used, logic suggests that the waste heat would be used to heat the hot reservoir).

When the user wants a cup of coffee, he puts his cup beneath the spigot, adjusts the control knob at front until the digital display indicates the temperature he wants his coffee at, then presses and holds the dispense button. The coffee then comes from the two reservoirs in the appropriate proportions to produce that particular temperature.

In between uses (perhaps after every cup), the target temperature of mixing resets itself, to some temperature which is hot enough for most people, but not so hot as to scald people's mouths.