I'm always a bit baffled when people comment about how listening to the radio in your EV will reduce your range... maybe by 200 feet on a charge! but really, with a gas car you have to crank the radio up so you can hear it over the roar and vibration of the engine, in an EV you can hear the sound of the tires on the pavement!
I have a spare charge plug on the EV, I was thinking of using it for a heater, but I also think at times about the inverter idea, have a power in and a power out plug on the car.
A friend of mine has the welder for the elec-track tractor, along with the hand held electric rototiller.
I like the idea of Heated seats to heat your body instead of the car, much faster then waiting for a gas engine to warm up and more direct, really any battery powered heat like that should be direct, self warming steering wheel? you can already get 15 watt heating pads for motorcycle grips.
MiMod EV is a Battery Monitoring System for EV has an interesting product as well, high priced compared to my PakTrakr gauge (gives you full range of battery monitoring options), but the MiMod can give you your GPS, digital radio and a hand full of other options, all in a battery monitoring system.