There was a "format war" for ebooks (a "Tower of eBabel" for users)... EPUB won?
Wikipedia says that «... EPUB format is the most widely supported vendor-independent XML-based (...) is supported by the largest number of e-Readers (...). The popularity of Amazon.com's Kindle devices in United States has led also to the prominence of KF8 and AZW » ... It is a truth for this "Ebook publishers and readers" community?
- EPUB is a world-wide consensus? It is the most popular, for ebook readers today? We can put all money in this format?
- And about the "second place", what is the format? (PDF? MOBI?) This second format is still important for ebook-readers? There are reliable and updated statistics? (2010 example, 2009 example)
To join "public domain scenario" with "comercial scenario" perhaps another kind of statistics must be also used: a survey like "ebook users read more comercial or public content?"
Public domain and open content:
PDF: a lot of titles (!!) ... some reliable statistics?
EPUB: as of March 2014, Project Gutenberg claimed over 45,000 items in its collection (but have no format-download statiscs); SciELO and many other minor public domain e-book projects are also distributing ebooks. Another source of Ebooks, scientific articles: PubMed Central have 3.1 MILLION articles that now (2014) are ditributed also in EPUB format.
Comercial universe: ...? Amazon dominates?