If you have 30 minutes of free time, you can probably benefit by watching the video below from the WordCamp 2008. The presentation below is made by Stephan Spencer the founder and president of Netconcepts and the author of SEO Title Tag Plugin for WordPress, which I might add should be #1 plugin on your list to install if you are just starting to use WordPress.
(HT: ProBlogger)
UPDATE: To benefit from the above presentation download the PowerPoint Presentation that Stephan mentioned at the start of his presentation.