I'm happy to tell you that currently you can get both of my LaTeX books for just $5 each. This means the ebook versions of
- The LaTeX Cookbook (very new, appeared just months ago)
- The LaTeX Beginner's Guide
Btw. any ebook you bought can be "upgraded" to the printed book, which costs only 50% of the print book.
There's a bigger campaign of the publisher, ebooks for $5 at this time at the end of the year, so you may find further IT books such as about programming and web design. I happily let my LaTeX books be part of it, to spread the word of LaTeX and to gather new LaTeX friends.
If you got it: I would be very interested in your opinion, if you liked it and what examples from the book you liked most. I would be happy about an email to stefan@texblog.net or any forum post here.

Stefan