NEW Discount Books Daily – Mailing lists for free and discounted ebooks, paperbacks, hardcover books, and audio books [apply here] [supports Amazon, B&N, Kobo, Smashwords, Audible, Downpour, Apple]
The Choosy Bookworm – Free listings for your book promo [apply here]
The Daily Bookworm – mailing lists and Facebook posts.
Reddit – Targeted ads by promoting posts in category you like. [more info]
Booktastik – mailing lists and Facebook posts.
eReaderPerks – free and bargain ebooks. Submit your free listing for FREE book [here]. Paid listing also available [here].
ebooksoda – Submit your listing here [Amazon US & UK, Nook US & UK, Kobo, Apple, Google, Smashwords]
Fussy Librarian – Submit your listing here [Amazon, Nook, Kobo, Apple, Smashwords]
eFiction Finds – Submit your listing here (Note: “clean” fiction minus graphic language or illicit behavior) – may also submit books priced $2.99 and under
Book Club Reading List – get listed and join interviews with book clubs [listing fee applies]
Read Cheaply – Brand new mailing list advertisement – submit your listing here
EReader News Today – Scroll to the bottom where it says “Authors, submit your free Kindle books to ENT here”
Pixel of Ink – online form
eBooksHabit – fill out form for Free Listing. Guaranteed listing available for a small fee. NEW! Ebook submission service [a real time saver]
Ereader IQ – fill out contact form, they handpick books to feature on their Facebook page Book Basset and BookBasset.com
Kindle Nation Daily Paid Promotion – cost per day to be on a highlighted page.
World Literary Cafe – List your book for Free in WLC’s Dated Forums. Retweet the hashtag #WLCFreeToday
BookBub – PAID Advertising. Target mailing list by genre, price determined by number of mailing list subscribers. Includes support for all ebook vendors, Amazon, B&N, Google, Kobo, Smashwords, etc.
eReader Cafe – fill in the form
Feed Your Reader – Submit your listing here
Author Marketing Club – A single page to submit your Free book to many popular sites
Free Kindle Books & Tips – Fill out form. Will not promote erotica or books with graphic sexual content.
Freebooksy – They hand select the books they will feature. Fill out the form here.
Ebookbooster – paid site will submit to 45 free listing sites for $40
IndieBook of the Day – fill out the form
Frugal Freebies – Submission Form
Free-Bookz – Advertising packages for free and paid books
Daily Free Books – They automatically post free books, but you can pay to have your listing highlighted. See Author page.
Bargain Ebook Hunter – fill out the contact form, free, but listing not guaranteed, paid promo available.
Digital Book Today Top 100 Best Kindle Book List – submit request, book must have 13+ reviews with 4.0+ rating average Digital Book Today Paid Promos – visit the site and check for latest offering and price. Weekly Free feature for authors, interviews and guest posts.
Indie Book Promo – fill out “Free Day Listing” form
Snicks List – fill out form on THE DAY your book goes free (not beforehand).
The Kindle Book Review – Daily Freebie Alert (Paid and Free use the same form, check features desired), check site for latest price. Free Option requires 14-day advanced notice.
Free Digital Reads – follow the directions on their Author’s page to submit
IndiesUnlimited – Free and paid listings. See Advertising Page.
BookGoodies.com – Fill out a submission form.
Addicted to Ebooks Register as a member and post your freebie in the form provided
FreeBookFeed.com – free book submission form [must register for the site]
Free Book Dude – fill out contact form
EbookBargainsUK – specializing in UK reader audiences, PAID mailing list promo – special introductory prices
Indie Book Bargains (UK) – mailing list and social book site for UK readers
JustKindleBooks.com – fill out the submission form for your free kindle book or bargain priced e-book $2.99 or less. [they also sell a submission service for $35 where they’ll submit to 25 sites for you – a real time saver]
Freebookshub.com – Fill out the contact form [they want a $5 donation]
Freebookshub.co.uk – Donate for priority listing
eReader Utopia – list your free book on their site and post directly to their Facebook Page
Flurries of Words – paid submission information
StoryFinds – free listings (on donation basis) for your free book, paid promos alsoavailable
Kindle Book Promo – Fill out form
Kindle Freebies – send e-mail from the About Page. They also support SMASHWORDS codes.
Digital Ink Today – a listing of free books. I didn’t see a form to fill in. They must grab the feed directly from the Amazon API. You may post directly to their Facebook Page
Romance Reads – Mailing list and Facebook posts for deals on Romance of all types: erotic, historical, contemporary/new adult, paranormal, mystery/suspense. See advertising page.

List of Author/Book Promo Sites (Paid/Free)
(Check sites listed in the Free Notification section, a lot of them also have paid promos)

Kindleboards.com KindleBoards Book Bazaar thread http://www.kindleboards.com/index.php/board,42.0.html AND NEW KindleBoards paid ads http://www.kindleboards.com/ads
World Literary Cafe – Free membership includes forums to contact book reviewers, network with authors and bloggers, tweet teams, Facebook Like Chain, Twitter Follow Chain, Book Tagging Chain. Paid promos available also.
Kindle Fire Dept – Sponsorship for featured book of the day.
Masquerade Crew – Book Promotion, Blog Tours, Tweet Service, Banner ads
Author’s Den – Free membership includes Author page, book list and links, contact information, and messages.
Author Marketing Club – Forums to connect authors to readers, e-mail lists, book cover gallery. Free
EpublishABook – lots of informative articles on self-publishing. Promos and Ads available. Free Book Reviewers page Like their Facebook Page
Indie Book of the Day – Submit your book for an award if it is professionally edited and has a cover that looks professional. Like their Facebook Page too. Paid promos available.
Book Daily – Book Samples for Book Lovers, Free Author’s Account
BookBub – PAID Advertising. Target mailing list by genre, price determined by number of mailing list subscribers. Includes support for all ebook vendors, Amazon, B&N, Google, Kobo, Smashwords, etc.
PeopleReads – Listings and Email List. Books must have more than 25 reviews and a 3.9 average. See Submission Guidelines.
Daily Free Books – Ads available on their website. See Author page.
Indie Book Promo – Fill out “Cheap Reads” form if book is under $2.99, paid packages also available.
One More Chapter – author spotlights, book spotlights, affordable pricing – details
Indie Book Bargains – UK Oriented site
Kindle Users Forum – UK Oriented site
Independent Author’s Network – One time Listing Fee to be included
eBooksHabit – Book of the Day listing book from Author’s Page
Book Goodies – Author Interviews, Podcasts, book features
OneHundredFreeBooks – Book of the day for $30, see booking page.
Ebook Impresario – Paid listings for free, bargain, book of day, week, etc.
The Cheap eBook – (formerly thecheap.net) – ads, banners, Facebook posts [no free book promotion as of Mar 1, 2013]
BookPinning – Online digital magazine, pin your book, paid and free features.
Awesome Gang – Free Book Promo for Authors. List your book for Free
Indie Book List – free listings, excerpts and list of reviewer blogs
Addicted To Ebooks – Free listing available – need at least five reviews on Amazon
Independent Author’s Index – One time Listing Fee to be included, multiple promo opportunities, including free social network marketing of your profile, posts and links.
Book Tweeting Service – List of Book Reviewers (Free) Advertising and Tweeting services available.
KindleMojo – Free listing available
Free Ebooks Galore – See Advertising Page
The Ebook Daily Deal – cost of listing is buying the author’s $2.99 book
Best Ebook Reader – Fill out form and they will promote you for free on their Facebook Page for one day.
StoryFinds – promotes on website, facebook and twitter, See Author’s Page for what’s available
Flurries of Words – Listings are for $1-$5 donations. See Advertising Page.
Flurries of Words (UK) – Sister site for Flurries of Words. See Advertising Page.
The Serious Reader – Free Author Interviews, Guest posts and Book features in return for putting badge on your site. See Author Information Page. [Also features Nook books]
Indie House Books – Free book listing with signup to newsletter
All Mystery E-Newsletter – A newsletter for readers of mysteries and thrillers. Author Promos [mystery/suspense/thrillers/cozies] available across all social media avenues (e-mail, facebook, twitter, pinterest, goodreads, homepage website). See Author Weekly Promo Page.
Indie Book Festival – Seasonal book sales support
BookGrow.com – Free book listing with backlink to their site, 5 reviews – information page
BookSends – E-mail advertising, Author’s sign up here.
EbookBargainsUK – specializing in UK reader audiences, mailing list promo – special introductory prices