We’ve recently covered Bing Image of the day desktop gadget a tiny gadget shows Bing image of the day along with Bing search box, Bingrounder a free app automatically grabs image of the day from Bing homepage and sets as your desktop background.
You can also enable Bingrounder preferences to saves Bing images locally to your Computer. Bingrounder by default configured to run at system startup.
Bingrounder is freeware, works with Windows XP/Vista/7 requires .Net framework to be installed in your Computer.