I have more than two years as LAMP programmer and I'm thinking in working as freelance.

I would like to look for potential customers in my city (80.000 people in Spain). But..what and where are my bussines opportunities? I mean: I know that a shop that sell shoes could be interested in creating an online shop to sell the shoes on internet. That is an easy example. What I want to know is what other types of medium and small firms could be interested in web apps and in what kind of services could be interested. Is there any web site that documents this?