Even if you don't love Bing's search, you probably appreciate its home page backgrounds. Now you can set those Bing images as your desktop wallpaper through an official theme and keep it updated automatically through an RSS feed.
Windows 7 users need only to download the theme package from Microsoft's offering page and double-click it to set up a "Bing Dynamic" theme. By default, the wallpapers rotate every minute or so, so you'll want to head into the settings to slow things down a bit (click the "Desktop Background" link at bottom). You'll get three months of Bing wallpapers through the feed, automatically updated each week. Each image has a Bing watermark, but it's not too ostentatious.