These may be old news for others, but they're new to me... A rating of different e-book discovery services, broken down by effectiveness for different genres, at: http://selfpublishingadvice.org/ebook-discovery-book-promo-services-review/ And a reliability rating for a variety of e-book publishing service at: http://selfpublishingadvice.org/allis-self-publishing-service-directory/self-publishing-service-reviews/ The market changes so fast that these will probably only be relevant for a few months unless they're updated, but it looks like that's the plan for the second on, at least....