While building-out the infrastructure for my tennis racquet rental service, http://racketrent.com, I've created a landing page to gather contact info from early adopters.<p>I've done a limited AdWords buy, which is converting at about $5.40 CPA, but this obviously begins to add up quickly, so I'm not sure where to go from here.<p>I would love some product marketing advice from the HN community, especially as it relates to on-page copy and value propositions as well as ways to build traffic and generate interest.