I think the photo speaks for itself. The CCPI plugs into your cigarette lighter and provides two 120-volt AC outlets along with a powered USB port.
You could use it to power/recharge your laptop, phone, portable printer, microwave oven, or whatever.
(Hmm. What would happen if you plugged an actual coffee-maker into this? Some damage to the space-time continuum, I suspect. Physicists, discuss.)
The Coffee Cup Power Inverter is available from ThinkGeek for $29.99. That's less than most other inverters I've seen, and it's way cooler to boot. If I spent more than 10 minutes per week in my car (my BNET overlords rarely let me out of the basement), I'd grab one of these in a heartbeat. [via Gadget Lab]
One more product shot: