Total Offtopic but you're a "gtk hero" baf so I have a question for you.
did you ever try loading a gtkbuilder.xml yet on the kindle Touch/PW/whatever.
Even my "hello worlds" are failing, (that run okay on the PC) wondered if you had any glade related thoughts. Just a random question.
I was just reffing http://developer.gnome.org/gtk2/2.24/GtkBuilder.html