I have found a great stomach exercise. sit on a foot stool. (or something with no back on it, at height your feet touch the floor naturally) Then lean back a little, and twist your shoulders right and left, while lifting your feet off the floor slightly, and moving them in the opposite direction as your shoulders. I have lost one inch in my waste line so far.
You can also stay in the same position, and just lift your knees up and down, but no holding on.