It seems that Microsoft eventually decided (after much hesitation) to officially adopt Firefox' icon for representing XML feeds, and that they will use it in the upcoming MSIE 7 and other products such as Outlook.
It's almost weird to see Microsoft adopt a competitor's "standard", especially given the fact that they had been thinking a lot on their own RSS icons a few months ago. And anyway, it's just funny that they adopt "minor" standards (an icon, whoah, big deal) while they just cannot conform to the other, important, web standards :-ΓΕΎ (via)