The big dog site is a well-developed source about instructional design, performance and leadership. http://www.nwlink.com/~donclark/index.html
An interesting Twitter list about ebook production.http://search.twitter.com/search?q=%23ePrdctn
Websites about ebooks.
Self-directed adult learning: some implications for facilitators.
What is your Learning Style?
Mager’s Tips on Instructional Objectives.
The Adult’s Learning Projects, A fresh approach to the theory and practice in adult learning.