I don't think ethanol is ever going to be a major part of solving the problems of our dependence on oil. It may however, be part of a temporary, partial solution.
The debate is still on going as to if there was ever any real connection of the food prices and supplies due to the ethanol production beyond maybe a small impact when President Bush was touting ethanol.
Most experts that have studied the issue have concluded that ethanol in any real quantities, will not be made form corn. There are many other plants out there that are much more cost effective and efficient. Brazil, second only to the U.S. in ethanol production, is using sugar cane.
Brazil is the world's second largest producer of ethanol and the world's largest exporter, and it is considered to have the world's first sustainable biofuels economy. http://en.wikipedia.org/wiki/Ethanol_fuel_in_Brazil
Many think the first real alternative energy to challenge gasoline to run our autos will be electric cars. There are a few already on the market and it remains to be how well they are accepted. One of the major problems electric cars are having to over come is recharging stations, or lack there of.
The Smart Car is starting to pop up in the parking lots in my area. http://www.smartusa.com/
Zap is another one: http://www.zapworld.com/
Vespa is coming out with an electric scooter that will have a small gas engine that will be used only to recharge the batteries. The show I seen on it said it will get over 400 miles a gallon. Keep in mind, it is only charging the batteries, not powering the scooter.