Similar to the dynamic Bing RSS Feed theme, Microsoft has now releases Bing Maps aerial imagery theme for Windows 7.
Get breathtaking views of the United States delivered to your desktop with this free Windows 7 theme that captures the best of Bing Maps aerial photography. Once downloaded, this dynamic theme updates automatically through an RSS feed.
Microsoft introduced dynamic themes for Windows 7 that add new backgrounds automatically to your desktop through an RSS feed.
Such dynamic themes are updated by an RSS feed, so fresh images show up on your desktop automatically. When you subscribe to the RSS (Really Simple Syndication) feed, your computer automatically downloads new images when they are added to the Microsoft theme server and you are connected to the Internet. The images are saved to a special folder, and will automatically appear on your desktop when you use the dynamic theme.
Head over to Microsoft to check out and download the Bing Maps aerial imagery theme.
You can learn more here about RSS fed dynamic themes for Windows 7.