1. I had to change
toolbar = NavigationToolbar(canvas)
> to
toolbar = NavigationToolbar(canvas, win)
> where win is the GTK window object. I guess the
> matplotlib API is still unstable. 
Oops. This one slipped under my radar screen. Sorry I didn't
announce it as an API change. This also break
examples/embedding_in_gtk2.py, for the same reason (fixed in CVS).
Thanks for letting us know...
JDH