One of the biggest objectives in the way I've designed my blog is to get people to subscribe by email to my content. At this point, I now have a healthy pipeline of thousands of new subscribers per month.
Using mailchimp, I now have an autoresponder as well. It mostly sends the single highest-performing kind of email I've seen: A list of links. It recommends a list of my older content, first focused on growth, then focused on product/mobile.
Today, I've also added a final email in the autoresponder, which is an invite to join us here at The Backchannel. I'm hopeful that this will lead to a nice trickle of new users signing up every day. Should be fun!