How much is the little TM next to "Coca-Cola" worth? How about more than US$15 billion per year? According to this ACNeilsen report, there are 43 worldwide billion-dollar brands, and Coke tops them all, followed by Marlboro. The complete list, by value:
Coca-Cola
Marlboro
Pepsi
Budweiser
Campbell’s
Kellogg’s
Pampers
Benson & Hedges
Camel
Danone
Fanta
Friskies
Gillette
Huggies
Nescafe
Sprite
Tide
Tropicana
Wrigley’s
Colgate
Duracell
Heineken
Kodak
L&M
Lay’s
Pedigree
Always North
Doritos
Energizer
Gatorade
Guinness
Kinder
Kleenex
L’Oreal
Maxwell House
Minute Maid
Nivea
Pantene
Philadelphia
Pringles
Seven-Up/7-Up
Tylenol
Whiskas
It's interesting that the top brands are sodas, cigarettes, and beers. Make sure to note that the study only includes brands that have a presence all around the world.
Oligopoly Watch has a table with more information, so rather than recreate it I'll just point you there.