Economic Stimulus - incentives to buy cars and appliances

Recently the NY Times reported in the success of an economic stimulus program in Germany where owners of cars at least 9 years old were provided a 2,500 EURO incentive to purchase a new vehicle.

Lets borrow the idea in the United States. Lets give an additional 35% incentive if the vehicle gets great gas mileage.

Lets give folks with refridgerators over a certain age an incentive to buy a new refridgerator. The refridgerator is apparently the appliance that uses the most energy (besides an airconditioner). While we're at it, lets do the same for airconditioners.