Looks pretty interesting. I like the curation a lot better than some others I've seen. Although this may be a function of user base and audience at present. My comparison would be Goodreads, which is so overwhelmed with historical romance, fluff, young-adult sci-fi, and New-Agey self-help that I've yet to see anything on their newsletters that looks remotely appealing to me. People love that stuff, but it's not what I'm looking for.

I'd be curious (at some later date) to know what kind of a return you're getting on Amazon affiliate fees. At this point, that's the most reliable advertising income stream on my side-projects. It seems to be the best deal going, considering it's a pretty minimally invasive kind of advertising, and they actually pay a decent cut on referred sales. And that's on a piddly little blog that has some reviews, some code tutorials, and a page where I list some favorite books, as opposed to something like this which is really designed to get people to convert.