Wallpaper Downloader 1.9 has been recently released which allows you to download the bing search engine background images automatically In My Pictures >> Bing Wallpaper. All the downloaded bing wallpapers will have the dimension of 958 x 512 pixels [ width X height ] which is good to set on a average sized desktop monitor. It will run automatically when you log on to windows and can be added to system startup as well.
The good feature of this application is that it lets you do everything automatically from downloading bing search background images to setting them as desktop wallpaper, it will keep downloading new bing images found on internet automatically and will keep rotating latest bing images as your desktop background. It will automatically set the downloaded bing images as desktop background to make it to Fit to Screen, Tile or Center and set time duration to change the bing images set as desktop background wallpaper.
Note: I just want to say to the developer that It really nice and intelligent application being developed and all credits goes to the developer of this application who has taken care of almost everything.
Download Bing Wallpaper Downloader