Here's a great plugin to help you work on your SEO for your blog.
You can configure meta-data (that's the stuff viewer don't necessarily see but search engines do see) in your posts, pages, categories, etc. You can define your tags, keywords, meta descriptions, site name, and more. You can even add Google Analytics, Google Webmaster, and more...I seem to keep typing that phrase "and more"...well -- truly -- it's "AND MORE". Love it! (And, please understand that I make part of my living from doing Search Engine Optimization.)
http://wordpress.org/extend/plugins/headspace2/ (Their website has a video demonstration...go video directions! Yeah!)