Bill Gates Puts Classic Feynman Lectures Online
I'm the principal developer on Project Tuva, and I've posted a bit on my blog about the technical details of the project, in case anyone's interested: http://blog.endquote.com/post/144450114/project-tuva-post-mortem
Regarding all of the Silverlight criticism -- yes, the videos could have just been posted in ogg vorbis or something to make everyone happy, but the Silverlight app adds many additional features in support of learning. Think of it as the bonus content on the DVD release. It's actually pretty cool. Silverlight isn't evil, and as someone who's very familiar with both Flash and Silverlight, I can tell you that badly-behaved Flash apps are more likely to make your system unstable than Silverlight apps will.
Little Demand Yet For Silverlight Developers
As a Flash developer, you shouldn't switch. You should be aware of and work with both technologies, know which is best for which project, and become a more valuable and sought-after developer because of it. At least that's what I do.