This is a pretty cool research project. I do not use Visual Studio but being able to search for and use code-snippets inline can be quite the productivity booster. Lord knows how many times I use google.

Have you considered perhaps including more data sources ? I'd imagine for example a public code repository like Github or Codeplex will extend the range of possible "How Do I" questions that can be answered.

On an unrelated note, I have almost always been disappointed by the search-quality of Github. I know they have a lot of public code but they don't do a good job of surfacing relevant code results. Imagine for example, how cool it will be being able to type into Github, "How to compute MD5, C++" and seeing the relevant code.

Actually, thinking about it, there is nothing preventing Microsoft Research from taking this tech, and turning it into a natural language web code search service. Now that would be awesome !