Blogger Christopher Penn insists that HTML5 will change email marketing. He has identified the next big thing: “We at Blue Sky Factory have decided to take email marketing to the next level with the only logical conclusion: infomercials in your inbox. Instead of plain, boring text or pictures that don't move, imagine having full 480p video delivering your message, complete with timed calls to action!” He has to be kidding. Well, it turns out he is. To read the entire April Fool's Day post, click here.