A great way to increase the circulation of your blog's content is to trawl through the web adding your site to blog directories, and making sure you ping them everytime you update.
Unfortunately, as I can personally attest, this takes for ever and is incredibly tedious.
Why not get help from your readers? By adding a social bookmarking button to the footer section of your blog, you can give your readers the option of sharing an article they like with others in their networks.
Go to Add This to get a free 'add' this button, that will allow your readers to submit your posts to facebook, twitter, myspace and many, many more social networking and article syndication sites.