If you want to access information on everything about cars, then you are looking for KellyBlueBook used cars guide. This wonderful resource contains everything that you need to know about automobiles, whether they are new or used.  It also contains essential information about loans and insurance concerning any car that you want to avail of. The Kelley Blue Book has started its roots from its founder, Les Kelley. Sometime in the 1920’s, he gave some automobile dealers a complete list of the cars that he wanted to own. The list also includes the prices that he is willing to pay for them.