It surely is very important for the SEO purpose as we are living in times where life without search engines is an impossible reality. Soon if you don't find yourself indexed in google you are not. So Search Engine Optimization is important for everyone including small sites and blogs.
Soon we are going to start a series of screencasts on how to write blog entries like a pro blogger for small and medium websites owners. Please follow these tutorials on SEO at: http://seosurf.wordpress.com/