I think it's now safe to say that the Road Runner is probably the most-used Warner Bros. character ever in advertising. Candy, credit cards, cars, food, batteries, soda, and the list goes on, and on, and on. Here's his latest appearance, again for Time Warner Cable's Road Runner Internet service. It's actually a pretty clever ad. Too bad it's impossible to find a Road Runner cartoon on any channel Time Warner Cable provides.
Update: Here's another one!