There is an increasing push for Diesel vehicles. With better mileage, cleaner emissions and the ability to run grain-derived diesel fuel, diesels aren't sounding so bad. One car I've got my eye on is the VW Golf. 46 MPG sounds pretty nice.
A popular criticism of old diesel engines is the exhaust - smelly and polluting. This problem has largely been solved due to better emissions control. (Read about this application in the Jeep Liberty here. Look for the 2.8-litre common rail diesel information.) The picture below shows advanced emissions control from Daimler-Chrysler.
The text reads:
"DaimlerChrysler is shaping the future of diesel. While common rail technology adds new excitement to the driving experience, next generation emission control technology helps cut down on raw emissions as well. The diesel particle filter (DPF) removes small soot particles from the exhaust stream, disintegrating them with a high temperature blast."