Mail lists and forums:

• Fixed Layout EPUB – LinkedIn Group
• ePublishing, eBook, ePub conversion help – LinkedIn Group
• EPUB 3/HTML 5/CSS 3 – LinkedIn Group
• … lots more

Online help and info:

• idpf.org – the official EPUB website
• … more

Official IDPF specifications:

• EPUB 3 Overview – Recommended Specification 11 October 2011
• EPUB Publications 3.0 – Recommended Specification 11 October 2011
• EPUB Content Documents 3.0 – Recommended Specification 11 October 2011
• EPUB Media Overlays 3.0 – Recommended Specification 11 October 2011
• EPUB Canonical Fragment Identifier (epubcfi) Specification – Draft Specification 8 November 2013
• EPUB 3 Changes from EPUB 2.0.1 – Recommended Specification 11 October 2011
• EPUB Publications 3.0.1 – Draft Specification 8 November 2013
• EPUB Indexes 1.0 – Draft Specification 14 January 2014
• … more?

This page is maintained by Scott Prentice.