I want to plead with Microsoft to eat their own dogfood and prove that WPF/E is a viable technology by using it on their own sites. Perhaps its too early, but with the WPF/E focus on Video it seems to me that SoapBox should evolve to use “WPF/E” instead of Flash IMHO.
I will say one thing, I like the UI of SoapBox better than some of their competitors. Its a nice clean interface. Here is the new Halo 3 spot via SoapBox: