Oh, thanks!
The first few chapters, I've been primarily targeting web and not testing on e-readers. I figured that until I knew whether people actually wanted to read it, I should just focus on making the web excerpts look decent and try to avoid over-optimizing for web.
Now that the book is officially a go, the PDF version is a first-class citizen, and I'll be testing e-reader experience on my rm2.
This is pretty off topic but did you test how your book works on an E-Reader? I check a sample chapter and there where a lot of pictures and colors to distinguish information, this will probably not work very well on my Kindle.