If you haven't heard, check out the new Dynamic Language Runtime (DLR). Awesome. It's been a long time since I've been excited by a technology.
I thought it was about time Microsoft brought something like Silverlight out. There have been numerous Microsoft projects trying to introduce new UI technologies that never got released. With Windows Presentation Foundation and Silverlight, Microsoft has firmly put up a neon sign showing how to construct the next generation of rich user interfaces. It solves the Rich Internet App (RIA) puzzle.
But the DLR vastly improves this proposition. RIAs, installed on demand, built with your favourite dynamic (or static)...