Sorry my bad... U should install the widget by running Code: dpkg -i maemostash_0.1-1_armel.deb as root. Then you will see it on your desktop (if all goes well) or in your 'Add widget' menu. Don't try to run it from X-Term 'cause then you'll only get the main window and no widget.
dpkg -i maemostash_0.1-1_armel.deb