It's nice to build up a roster of pre-signups before you launch. It's super easy to throw up a launchrock.com page on your site. Collect emails while you're bui

It's nice to build up a roster of pre-signups before you launch. It's super easy to throw up a launchrock.com page on your site. Collect emails while you're building the product, then when you launch just send a blast to that group. Should get you the initial inertia you need. It's also worth trying to get your thing listed on sites like betalist and producthunt. But in general, I really wouldn't worry about it. Early adopters LIKE to be first. So while a normal user would be turned-off by an empty marketplace, your early-adopters won't necessarily see it that way. They'll help you build out content and fill up the marketplace, so that normal users find it attractive down the line.