I subscribe to Real Car Tips (free).
Car Buying News and Tips for Car Shoppers. It's a weekly newsletter on car prices, discounts, and the latest car buying strategies and tips. They also have links to car buying services. One thing I learned is that Florida has one of the highest dealer fees in the nation. They have a section that tells you how to get the best new car price.
How to Get the Best Price on a New Car - Step by Step Instructions