Looking real good.
Only thing I noticed missing was that the application (Sphinx) can support "voice training" (perhaps intended for a later example).
Edit:
Well, since I mentioned it, I will include the link here - -
Which IS NOT a promise that the Kindle version will ever be capable of being trained.
http://cmusphinx.sourceforge.net/wiki/tutorialam
Start your timer now -
See how long it takes the Duokan crew to learn it also understands Chinese and steal the demo
from us from you.