What a joke!
I recently recommended an organisation not to use Silverlight but choose Flash for a non too complicated image manipulation\markup system. I hate flash and told them the same, I hate all plugins (for general user usage). But, . . . . given they insist on I.E. 6 support then lesser of two evils IMO so flash wins, see later on HTML 5 \ canvas object. Seems to me a huge number of organisations consider moving from I.E 6 to 7 an upgrade :(
I'm glad Apple said no flash, I don't want an iPad, much happier with a android + Asus transformer but at least they have marketing dosh to say get lost to Adobe and force their hands to use HTML5.
BTW if you must cater for I.E 6/7 forget things like canvas for I.E. solutions, YMMV but anything other than a basic app just dies a death and even does that in an ungraceful manner (try drag n drop). No surprise of course - when complex jQuery manipulations need to be used on I.E. 6,7, another kind of death. I could be kind and say well I.E. 6 is circa 10 years old but it really is a nuisance to cover and unfortunately 7 is no better and in some respects worse.
I do feel sorry for people trying to keep up with MS technology at the moment, seems more volatile than even forking Android ;)