Larger than powerhouses such as DuPont, Sara Lee or McDonalds, the $25 billion PepsiCo is one of the most successful consumer products firms in the world. Frito-Lay rules the salty-snack business, selling $14 billion worth of Doritos, Lays and other munchies last year. Pepsi-Cola sales topped $5 billion, second only to Coca-Colas $20 billion. While Pepsis market share slipped slightly against Coke in the U.S. last year, it had gained steadily for three years before that.