I started a site about two years ago to aggregate free kindle ebooks from Amazon and display them in a Pinterest-like fashion. It was just a little weekend project, as I had a new job and wanted to brush up on my PHP skills. Naturally, I monetized with Amazon's affiliate program and Google AdSense. The site grew steadily, and has paid my rent and utilities throughout the last year or so of college.
Now it's seeing more traffic than ever and I feel like I should actually capitalize on it a little more and start capturing email addresses. I read a new post every other day about how people regret not starting to capture emails earlier, and I've put it off for too long.
The only problem is that I don't know what to send them. They go to my site for free ebooks, so I thought maybe I could offer up a weekly digest of the best books in their selected categories, but books can go from free to paid at any time and drop off my site. I don't want to send people links to books that were free a few days ago and no longer are, as the whole schtick is to give them free ebooks.
If you signed up for a mailing list on a site you went to for free ebooks (and nothing else), what would you want or expect to receive? Would it be acceptable to collect emails without sending them anything until I have content sorted out?
I want to capture email addresses and monetize that list, but I'm not going to do it unless I can provide the user with some value. How do I provide that value?