Big-name companies may soon be able to place adverts on the Windows 7 desktop thanks to a marketing-friendly initiative from Microsoft.
The theory seems to be that Windows Themes, Gadgets, Internet Explorer 8 extensions can all be linked together to create a complete branded desktop and Internet "experience" for the likes of Ducati, Porsche, Fox Movies and others who are participating in a not-so-hush trial. If successful, it could lead to a flood of other marques creating downloadable bundles for fans to adorn their systems, but with a greater product focus than the traditional fan-made themes and backgrounds of old.

more info:
http://apcmag.com/advertising-coming-to-a-windows-7-desktop-near-you.htm