My small business has been online for over a year and that sounds like the amount of hits versus sales we had in the beginning. It takes time to build customers. Probably of those 400 postcards, only a few people actually went online.
It takes time and word of mouth/ ads for people to visit a new site and use it. I had never heard of Craigslist till an aquanitance told me about it, now it's a brand name.
I looked at your webiste, it is easy to use and not cluttered.

Have you considered giving people the option to post yout logo/link on their social or business websites? It's a very popular option on places like My Space.

Leah Oviedo
Mercado del Mundo