Oh, here's some links:

How to find a CNG station near you:
http://afdcmap.nrel.gov/locator/LocatePane.asp

All the new 2003 vehicles that come with CNG from the factory:
http://www.afdc.doe.gov/pdfs/my2003_afvs.pdf

... Most new CNG vehicles are trucks or have high displacement engines. However, there is a 2003 Chevy Cavalier with a 2.2 Inline 4 that runs bi-fuel (CNG or Gasoline).
http://www.gmfleet.com/us/acquiring/vehicinfo/summaries/ChevyCavalierBi-Fuel.pdf

325 HP sportscar with CNG (4.7L V8):
http://www.car-truck.com/chryed/concept/charger.htm
http://www.ott.doe.gov/pdfs/dodge_charger.pdf