This looks fantastic! I've been developing desktop-only in .net, and am now starting to get into Silverlight. I love that, unlike Silverlight, this looks like it doesn't need a plugin at all, and is just straight javascript at the end.
I'll be curious about what people who are more experienced have to say about its usefulness. Surprising that this post doesn't have any more comments.
"However, the problem with all of these approaches is that they are all bound by the limitations and frustrations of HTML and CSS. Unfortunately, the problems with HTML aren't going to be solved anytime soon."