Hey, this looks kind of nice actually. But why hide the content behind an email sign-up, why not also provide an RSS feed, or at least the latest 1-3 send-outs? If you hadn't provided that link to the latest e-mail I would've brushed it off entirely and not given it a moments more thought. But you did provide that link, and I found the content relevant and interesting, and even dove deeper into a couple of the articles.
The content in this one e-mail is pretty good, but before I sign up I'd like to see more. But also it's not clear to me that I'm your customer, because reading your post here it sounds like your customer isn't the consumer of these feeds but actually the producers? I'm not one of them, so why do you care about my e-mail address, other than to sell to your actual customers down the line?