Are you a professional software developer, or at least spend a lot of time doing it? Do you use Javascript? If so then take a look at this application. Javascript Box is a small gadget for Google that lets you test small Javascript code fragments on your Windows desktop.
A gadget is an application for Windows, normally very small in size. It runs directly on the desktop independently and doesn´t need any other external application, file or library.
NOTE: For Javascript Box to work correctly, you need Google Desktop (version 5 or later) previously installed on your PC.