Advice for contacting local merchants?

Hi guys, I have a question for you guys. I'm a fairly good hacker/programmer and have built a lot of cool stuff but I am not so proactive at the business end of things -- it's not something fundamentally interesting to me. Recently I've built an app that is sort of like pulse but it's for displaying and browsing products... any store can add their product. I'd like to get businesses to start putting their products on it. I built a landing page but I don't know how to get businesses to start registering -- How do I build the initial userbase? Here is the simple site I put up: http://muonmobile.com/