And for those of you who think this is a joke or paranoia, a few years ago Microsoft purposely screwed up the display of MSN for Opera. It wasn't a render glitch, as MS detected Opera and sent out bad CSS -- Opera set to ID itself as IE worked fine.
I remember that fiasco, which was why I suspected that this time. I remember that if you opened the page and saved the HTML locally with IE, then opened the file with Opera, it was also fine.