I just watched the webinar at this page
and was rightly blown away by the RichTextBox demo with the chart visualization and docking controls. However, I cannot figure out where the code for that demo is. The presenter said something about Twitter, but I don't know what twitter is (well, I do, but I don't acknowledge it :)).
My constructive feedback would be to put a link to the code for these demos on the same page where the webimar can be viewed. Preferably, next to the media player where it is easy to find.
Cheers (and if you do know where that code is, I'd love to get my hands on it - a triumph!)