Indeed, I still have mixed feelings about this thou, but right now, regular 'desktop' IE took a bit of effort to get flash 11 to work with.
Heck I normally browse with no script, or at the very least flashblock/click to flash. But I'm a power user, I know that "hmm its probably lack of flash" and flick over. My mum dosen't.
My question is what about all those grown up things active-x helps with? Sure it's an attack vector, but ultimately everything on the PC is.
Nice thing thou, because this is windows, they won't ban other browsers.