LemonThrower, we are now using the Citibank Driver's Edge card. We get 2% cash reserve built up on all purchases, subject to certain limits.

The cash is mailed to us when we buy or lease a car.

I think there is a $1500/year limit or $3000 total, something like that. The amount of rebate reserve appears on our statement each month. When we get to the limit we will start using a different card.

The cash rebate makes sense although in the USA it is taxable unlike FF miles. 2% cash back is pretty compelling though.