SEOMoz did a great Whiteboard Friday video on using SEO to grow and expand your e-mail marketing list.  Here’s the synopsis and corresponding video.

Step 1 – Attract the Right Audience
Target keyword searches in which users are looking to find out more or discover information related to your product or industry.

Step 2 – Deliver Compelling Landing Pages
Build your credibility right off the bat by providing guides, data points, reports and interesting blog posts directly related to the search terms the user found your site with.

Step 3 – Offer Something Awesome (and even Free)
Increase your signup rate by offering an extended report or content relevant to your user’s needs.

Step 4 – Deliver Non-commercial Messages First
Don’t try to sell the user something in their first e-mail message.  Fulfill expectations, grow trust and build great relationships before anything.

Step 5 – Iterate
Repeat your actions.  Keep getting better and improving on your results.  Tweak and test.