As promised, here is the .NET Rocks recorded panel on RIA at Code Mash. It was a blast and got a great reception.
Participants in the panel included myself, Carl and Richard, Josh Holmes (Microsoft RIA Architect Evangelist), Leon Gersing (Teligent), and James Ward (Flex Tech. Evangelist).
Takes a few minutes to get going, but then it gets quite interesting.
More: Report on CodeMash 2009