From kotaku.com (http://kotaku.com/5318124/new-dashboard-commercials-bring-ad-breaks-to-your-360 ):
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As many of you have no doubt probably seen by now if you’ve been connected to Xbox Live, Microsoft’s new dashboard advertisements have begun appearing for Xbox 360 owners.
Rather than the standard, static advertisements you’re used to seeing, these bring running commercials to your 360, in some cases complete with video and, more annoyingly, sound. You can see an example of one running in this video here.
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Full Story: kotaku.com (http://kotaku.com/5318124/new-dashboard-commercials-bring-ad-breaks-to-your-360 )
More: continued here