The snakes on a plane marketing that allowed anyone to create custom phone calls from Samuel L Jackson was a terrific example of customized viral marketing. If you received one of these calls, you immediately wanted to go send it to all your friends.

Last week Yahoo announced a new customizable, personalized song from Jessica Simpson. While this isn’t a viral marketing program, the personalized aspect will probably make this a much larger success than if it were just a normal download. It’s priced twice as high as a download on iTunes, but what is an extra buck when you can have Jessica Simpson include your name in the song?