Yesterday, Levi sent me a link to this add-in for Reflector that disassembles a Silverlight applications and shows your the JavaScript to run it. I must say, it's a pretty nice little add-in (that includes its source) for Reflector. Below is a picture of the disassembled Silverlight Airlines demo given at MIX '07:
Check it out if you have the time, it's pretty sweet!