In-car adapter for macbook air - what's the latest on this please?

I've got the latest macbook air and need to use it, and charge it, from a 12 volt car socket. I understand that I cannot do this though - surely I must have been misinformed?
It seems that apple do make an "empower" socket rated at 15 volts that you can use on a plane, but it doesn't recharge the battery. However, clearly this limits the usefulness of sorting out some kind of rig-up, suggested in some chat rooms, with a dc-dc (ie 15v - 12v) adapter.
Does anyone know where a dc in-car adapter for a macbook air is available?

Modern Outpost is coming out with a MacBook 12V DC car adaptor, and are hoping to add an Air adaptor in the near future...
http://modernoutpost.blogspot.com/
I see the comments about using an AC Inverter, but I prefer to speak about solutions that will work with solar chargers too. An AC inverter will not only NOT work from a solar panel without extra & heavy equipment, but it wastes more than 20-40% of your power... first it converts your battery power to dirty household AC, then your Apple adaptor converts it back to DC for your Mac.
I suggest using a DC adaptor and bypass the middleman.
Modern Outpost's website has nothing posted yet...
http://www.modernoutpost.com

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