After upgrading from a Kindle Keyboard to a Kindle Touch in March, I have to admit there's one feature I do miss -- the progress bar at the bottom of the screen showing where you are at all times in a book.
If the TOC was formatted correctly, the chapters would also appear on the bar as nodes, which I found useful, too.
The Touch does show a progress bar, but only for periodicals, as far as I know.
IMHO, it would be great to be able to have this old functionality back, at least for those who miss it.
I'm a complete and utter noob when it comes to Java (but am planning to have a look at your tutorial, ixtab!
). Anyway, just thought I'd put the idea out there.