Really? Goodreads reliably emails me every month about new releases of authors I've read. I actually love them for this, because amazon does a terrible job of notifying me when authors from whom I've bought multiple books release new books.

ps: authors -- get a goddamn email list. You can write short fiction set in the same universe as your longer works and I'll buy it for $3 for 30 pages. Way more profitable than a whole book. Have a gap between releases? Spend 2 weeks and earn $10k or more. It's nearly free goddamn money. See, eg, Mira Grant.