Most shoppers use on-line information as ammunition to negotiate with dealers, but some are already using the 'Net to buy.
Internet services can cut costs significantly.
Ironically, Internet car buying services may ultimately put themselves out of business. Once dealers lower costs, prices drop, and manufacturers enter the retail channel with fixed prices, there will be little need for consumers to use a car buying service. So the online companies will only make money for another 4 to 5 years.