Of the top 50 vehicles researched on the Kelley Blue Book Web site, the totally redesigned Ford Explorer ranked number one in the sport utility vehicle category and number six overall, according to Kelly Blue Book. Kelley Blue Book said its Web site had more than four million visitors last month with a large percentage showing interest in SUVs and full-sized pickups. Requests for pricing reports related to the Explorer fell just behind those for the full-sized Chevrolet and Ford Pickups, the Honda Accord and Civic and the Toyota Camry. The public's appetite for SUVs does not seem to be sated, as the popular vehicles comprise a full 40 percent of the top 50 vehicle pricing reports requested. Pickup trucks received 20 percent, passenger cars 32 percent and minivans and luxury cars the remaining 8 percent, according to kbb.com. About Kelley Blue Book Based in Irvine, Calif., Kelley Blue Book is a resource for car-buying research and information. The company is currently celebrating its 75th anniversary. Its Web site, kbb.com, is the number one automotive site in the nation, according to Jupiter Media Metrix and Neilsen Net ratings. It attracts more than 4 million unique visitors per month, generating nearly 30 million pricing reports monthly.