General 

Adobe eBooks Central - PDF-based e-books.

Bibliofuture

e-books.org - a non-commercial repository of information related to e-book research and products.

JSTOR - organization committed to the electronic archiving of scholarly journals and literature.

 Technology and techniques 

Creating and Documenting Electronic Texts: A Guide to Good Practice

EBONI Electronic Textbook Design Guidelines

Microsoft Reader - electronic reader for Windows-based PCs, laptops, and handheld devices.

Open eBook - international trade and standards organization for the eBook Industry.

SoftBook Press - electronic book and paperless publishing system.

Suite 101: Ebooks For Profit - archive of articles about creating, marketing and selling electronic books.

 Publishers and suppliers 

1 E Books Com

Antelope Publishing Electronic Books

Awe-Struck E-Books

BookLocker.com

The eBook Directory

Electric Book Co.

Free-eBooks.net

ibooks, inc.

Independent Publisher

The Library of Free eBooks and Best Sites

netLibrary

Perfectbound - e-books from HarperCollins Publishers.

Project Gutenberg - free books on-line.

Senior Citizens Com (SM): Electronic Books Digital Library