I've worked on a lot of projects for Microsoft, including consumer software, internal solutions and industry demos. Some of these are public, and others are so secret that I can't even talk about the code names. But you can bet they're cool.
Highlights:
I built a complete audio streaming solution in Windows Azure (including a custom web server) to support high-performance mp3 streaming for KEXP, Seattle's best radio station.
The project also included a health monitoring application written in HTML5 and Javascript.
I led a group a Vertigo developers to assist the Microsoft team building Windows Intune, an enterprise system administration application.
Our work was done in Silverlight and C#.