A few suggestions

The Tyee
An article about the benefits of BC Books Online

Ebook resource page:
http://labs.oreilly.com/2009/03/epub-resources-and-guides.html

Mobipocket Developer Center
http://www.mobipocket.com/dev/article.asp?BaseFolder=prcgen&File=mobiformat.htm

An XML Primer for Publishers
http://toc.oreilly.com/startwithxml/

ebooks in Libraries
http://www.against-the-grain.com/

Excellent sources on daily developments in the rapidly-changing ebook world:

The BookNet Canada Blog

O’Reilly Radar

Mitoko Rich in the New York Times

GPC News

Canadian Electronic Library Publishers' Newsletter August 2010

Association of Canadian Publishers Launches Digital Conversion Project for Members (04/09) (PDF)

Canadian Electronic Library Selected by CRKN for 67 Canadian Universitie (08/08)