Leadpages – A terrific resource that allows you to create high converting landing pages that allow you to collect e-mails. I have been using this for years and it’s a very high quality product/service.

Aweber – The most popular email opt-in service and e-mail broadcasting service.  I use Aweber for all my newsletters and mailing lists. This is a must if you are serious about growing your Amazon business to the next level.