For a great example of a real application written on top of backdraft, take a look at bdRead, an intelligent document reader. bdRead hosts the backdraft reference manual here.

Other, more academic demonstrations and screencasts are listed below:

Link Description
see it! Demonstrates a typical frame window that includes a menu, statusbar, and splitter work panes.
see it! The omnipresent "hello, world" demonstation. This one does a little more and demonstrates accelerators and message boxes.
COMING SOON! This screencast describes the motivation, goals, innovations, design, and implementation of the backdraft application framework.