Jeff Wilcox, a developer on the Silverlight team at Microsoft spends a lot of his time (~80%) coding in C++. And that’s because Silverlight is a portable managed runtime and C++ (C with classes in this case) is what enables Silverlight portability. This hour-long video gives more insights.
Jeff also spends a significant amount of his time writing the managed parts of Silverlight (controls, libraries, etc.). He is an expert in both the managed and native programming models and he’s responsible for some of the really powerful and widely used Silverlight controls that you employ when you’re programming WP7 devices or Silverlight apps for Windows or OSX.