Have them come to you!

One of the easiest ways is to have them come to you! Search out similar sites and mass-marketing sites (www.adverwize.com allows free url submissions and includes them in a resource guide that is emailed to their entire mailing list) that will allow you to place your link on thier site to move you up within the search engine ranks. Also, make sure that your website is setup to maximize your keywords and crawler access www.submitexpress.com will do it for free and even offer free submissions.