The technology that drives wordpress and other blogs, is a highly interactive one. So for example, when you post an article to your blog, this is immediately pinged around many blog services on the internet. If you added tags as you should, then this help get the word around on what has been posted on these tags words.
In order to see the effect of this consider it as an outsider. Google alerts lets you know when anything has been posted on your particular topic of interest eg link building or internet marketing
And how does it know this? By being in touch with all the blog posts that are being made, for one thing.
So be sure to stay close to your industry by regularly posting topics of interest or associated events on you blog and letting the world know you exist.
As your blog develops then more people will naturally link in to you and this helps your rankings
One good service is seo nottingham