Jeff Finkelstein (@boulderjeff), of CustomerParadigm.com gave a presentation at WordCamp Boulder this year. During that presentation he talked about the fundamentals of how search engines work, what they look for, and what you can do both on your website and external to your site to enhance your search engine optimization efforts. Learn about page rank, keyword density. inbound links, and more.
Some definite SEO techniques to take to heart.