Max OSX Dashboard
To add an OnOneMap widget to your dashboard, simply download the widget by clicking the link at the bottom of this page. If you are using Safari, the browser will automatically unpack the zip file and offer to install the widget:
Click "install" to install the widget (if you are not using Safari, you may need to unzip the file manually. Once you have unzipped the file, double clicking on the extracted package will bring up the same dialog box as shown above).