Having a blog is all very well, but you have to keep it updated. Which in turn means finding things to write about.
Remember a while back when I talked about positioning? The first part of the positioning statement tells you who your target audience is. And they are the ones who care about what you're writing.
What problems do they have? What are they interested in? What solutions can you give them?
Take Action: Start a list of common problems that your target market has, then write about how to solve them. Add to the list every time you speak to someone and they mention something that is causing them grief.