Are you familiar with Matthew Inman? If not, you should be. Former CTO at SEOmoz, he’s also one of the most creative marketers on the Internet. He has used web-comics, online quizzes, and infographics as the basis for several massively successful viral marketing campaigns.
In this (unfortunately short) video, he talks about some of his experiences.
This video is just full of gold. I’d actually recommend taking notes.
You can check out his current website The Oatmeal for his more recent comics.