“For February 2011, e-Books ranked as the #1 format among all categories of Trade publishing (Adult Hardcover, Adult Paperback, Adult Mass Market, Children’s/Young Adult Hardcover, Children’s/Young Adult Paperback).”
(I believe they’re lumping downloaded audio books with text ebooks to get this result, which is cheating.)
Read the full article.
(Thanks to Tony Cratz on a private mailing list.)