PowerJolt from Griffin Technology plugs directly into the 12V power outlet (cigarette lighter) in your car and charges the iPad quickly with a full 2.1 amps. An illuminated ring indicates charge status and the PowerJolt's USB port can be used to charge any compatible device. A dock connector to USB cable is included.
You can pre-order the PowerJolt for $24.99. The PowerDuo is also available: Griffin offers the PowerJolt bundled with the PowerBlock for a discount at $49.99.