What are some ways (besides PPC) to market a book using online resources. -Press Release for sure but what else? It is a comic book for adults called "Pete the Postal Worker"
Have you thought of video marketing? You can use powerpoint to turn the comic into a presentation, then use windows movie maker to turn into a movie. Include a link to your site in the slides/video and then submit to Youtbube and all the other others automatically using Tube Mogul. That method is totally free as well so may be worth a try