Oh yeah, They have now done this in silverlight – The kind of stuff we used to do back in Flash 4 days! (Stop embarassing yourself, MSFT! Do it in Flash – there isn’t any other way to do this. Ever.)
Check out http://www.mojaveexperiment.com/ . This is a campaign for Windows vista and is done Entirely in Flash.
I am extremely impressed by seeing Microsoft’s confidence (or the lack of it) on their own platform when it comes to building their own applications. (or may be they know there isn’t a better way (there can’t be one!) of doing this other than doing this in Flash! That’s more like it!)
The application looks great nevertheless! Good work, Microsoft