How Stuff Works: Hybrid Cars  
   Graphical tutorial explains the workings behind these vehicles. Also includes some current real-world examples and related links.
   http://www.howstuffworks.com/hybrid-car.htm

Fueleconomy.gov  
   The Department of Energy's fuel economy site gives gas mileage tips, gas price info, and a tool to compare fuel efficiency of hybrids and conventional cars. The "Fuel Economy Guide" provides the government view on reasons to be concerned about
   http://www.fueleconomy.gov/feg/hybrid_news.shtml

Green Guide to Cars and Trucks  
   Ranks cars and trucks according to environmental friendliness. Using this consumer guide, buyers can compare cars, vans, pickups, and sport utility vehicles by their environmental impacts, including air pollution, global warming, and fuel efficiency.
   http://www.greenercars.com

EV World  
   News, forums, and marketplace related to electric cars, hybrid-electric and fuel cell vehicles. A lot of the content requires a paid subscription.
   http://www.evworld.com

Union of Concerned Scientists - Clean Vehicle Program  
   Offers background information about various clean transportation technologies including hybrid gas-electric cars, fuel cells, and all-electric vehicles. Also find an analysis of the potential of hybrid cars, driver viewpoints, and a green car buying guide
   http://www.ucsusa.org/clean_vehicles/advanced_vehicles/

California Car Company Initiative  
   A non-profit group promoting "plug-in hybrids" - hybrid gas/electric cars that have larger batteries and can be recharged at an outlet.
   http://www.calcars.us

Hybridcars.com  
   Concise site that serves as a good starting point for research about hybrid cars. Issues covered include gas mileage, the environment, foreign oil dependency, and currently available cars.
   http://www.hybridcars.com

Hybrid Car Guide  
   Provides hybrid car information and industry news for the curious or the enthusiasts, plus a fuel savings calculator.
   http://www.hybridcarguide.com