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You can get 75 watt heated seat covers pretty cheap from places like Speedway Motors, drug store heating pads tend to be 50 watts and get pretty warm (we use one at work for keeping granite slabs warm to cure epoxy) so a 12v 75 watt seat cover is going to keep you warmer per watt then any other option that I can think of, otherwise a 5 gallon 110v tank style water heater hooked to your heater core would work well when you could plug it in and should last a number of miles to keep the windshild clear, using battery power however to keep that tank warm is going to be a big drain so a ceramic heater added inline might be a good idea.
If/when I get around to putting heat in my electric car(s) I'm going to go with Peltier junctions and pull heat off the motor with them, thinking a closed loop to keep dust out of the motor, stacking them to get the most out of them.
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