SEO is important when it comes to getting traffic for your blog. Basically, SEO is like increasing your website's 'popularity' when people search a keyword related to your website. The higher your SEO is, the higher chances of people seeing your blog when they search a keyword in a search engine (Google, Digg, Bing, Yahoo Search etc.), thus grabs more attention from search engines to your blog.
But first, you have to submit your blog to search engines. For Google, you can add it at http://www.google.com/addurl/?continue=/addurl. Here are some of the steps I used: