I included a shockwave vid of what I'm talking about. I love being able to see exactly where I am in the book Chapter name: heading : subheading. This is one of my KEY complaints with the Kindle and most digital reading, but you have solved it masterfully here. One suggestion: if the title of the chapter or the section is too big to be displayed, a hover-over should show the entire thing
http://screencast.com/t/oZjs2jhbMeC
