Please email me if you find a bug or want to make me any other comment or feature request.
If you like Vibration Widget, please consider installing my other app, Profile Widget, which can do the same as Vibration Widget and a lot more (control vibration, volume, connectivity, screen settings, ...) in a single widget.
Profile Widget Lite: https://market.android.com/details?id=com.cygnus.profilewidgetlite
Profile Widget Full: https://market.android.com/details?id=com.cygnus.profilewidget
You have to add the widget to one of your home screens to use it. Just long press on an empty space of your home screen or press the Menu Key and select Add -> Widgets to show a widgets list in which you can choose Vibration Widget.