I usually stay clear of search engine optimization (SEO) discussions, but I think this video is worth your time. In the video, Corey Eulas teaches SEO tips, tricks, and best practices found to increase traffic from search engines. This talk includes examples with a look “under the hood” of a few actual sites owned by members of the audience. You will "discover how to enhance user experience and usability while making your site more search engine friendly".
It doesn't hurt to take Corey Eulas' advice and likely his tips will improve your chances for being ranked higher in the index pages of the search engines. However, I'm a firm believer that the number one tip for good SEO of your website is writing good content. Sure, you can tweak the code here and there and write the buzz words search engines may be looking for in order to help improve your site's listing in the search index. In the end though it's the quality of your content that will eventually win people over to your site.