I just learned how to install an "inset zipper" in a bag lining!
This means that the opening floats in the middle of a piece
of fabric without additional seams around it. The zipper
just discreetly points the way to a little, hidden pocket.
To get here, I followed Lisa Lam's tutorial. Very helpful
and clear, as is everything she writes on u-handbag.typepad.com.