Hey carju1. I was going to post sooner, but thought you had enough input, then I came across this
http://www.rlrouse.com/Ebook-Creator-Software.html, it's free and security features etc, but I just noticed that the author of software wants a link to him on your site , so anyways....
Also, I wanted to just say that although I won't forgo a good source of information, I don't like using PDF's myself, I find them sloppy and slow to navigate, Adobe reader v6.0 takes 6 - 8 seconds to load everytime, and the display is hard to get to a proper size . I know that there are a lot of powerful features as well, but it is serious overkill when I just read the things. Even MS Word is zippy compared.
I also like the .exe books I've seen because they scroll like an html document and navigation is almost instantaneous.
One more I like for more complex stuff is the .chm, or 'compiled help' for excellent navigation.
Hope I add some light, there's always a first time!LOL
Good luck with the book.