Got an email today from D2D. They now offer new release notifications to readers. What this means is that they'll put a button in the back matter of your book that the reader can click. Then that reader will be notified whenever I publish something new on D2D.
I logged in to the site and got the message pop-up about it. I clicked on the "find out more" button. Two clicks later, Mr. Wilson had the button added to its back matter. (So they said, anyway. I didn't find anything to indicate it on the story's layout page. But I'm sure it's there, or will be soon.)
That's why I love the guys at D2D. They make it all so easy. And they're constantly trying to improve their service. As far as "author-friendly" goes, they're the best around, period.
Next on my wish list: full mailing list functionality. :D