This just happened to me. I started my blog about five days ago and no traffic. Quite by accident I discovered that the default setting in my wordpress install was blocking traffic.
To fix, to to your adminstration page and choose Options.
On the Options page choose the Privavy subhead. You will find these choices:
Blog visibility:
I would like my blog to be visible to everyone, including search engines (like Google, Sphere, Technorati) and archivers
I would like to block search engines, but allow normal visitors
Click on the options you want to work for you.