Cool program but when visiting your site, people need to 'land' on a sexy screenshot, clear illustration, or animation that shows the functionality explicitly before literally anything else. An image that screams "this is an important presentation" with a person in the bubble confidently explaining it, then maybe something that shows how easy it is to use the iPad to mark things up. This is a communication product, so people expect it to communicate its purpose deftly. If people have to read to see how your product is better than their current solution, or scrub around an explainer video, most wont. Pretty much nobody seeks out solutions for problems they consider solved, and nobody spends more than a couple of seconds looking at a solution they don't think they need. To effectively communicate the purpose of your product to the larges number of potential customers, you need to immediately and explicitly show them how your product works to solve their problem better.