G2I has experience with managing double-opt-in email lists. This type of email list requires people to confirm their email address in order to decrease the likelihood of your messages being reported as spam.
A well tuned email list is a powerful tool for reaching many people all over the world. These people might be potential customers for your online store, members of an online movement, or people that would be interested in your site's new content.
Other tools like META tags, Sitemaps, RSS feeds, and Podcasts can be used to help people find your site, depending on your site's content.