It’s neither necessary nor wise to submit your blog to each and every Blog Directory available on internet, and in fact, I advise against doing so. To gain some insight as to why carefully selecting which directories to submit your blog and to is the best way to proceed please read my two posts titled: Blog Directories for Backlinks and Traffic, Promoting your Blog in Bloggers Forums and Selecting a Bloggers Forum.
Submitting Your Blog to Directories: A Primer
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What every blog needs is one way non reciprocal backlinks. Free article submissions to directories and content providers, article marketing, submissions of press releases and other forms of content distribution are a means of getting them.