During the last 10 minutes of Ander\'s talk The Future of C# he demonstrates a really cool C# Read-Eval-Print loop which would be a tremendous help in learning the language.
I just published a VisualStudio Extension that provides a REPL environment inside VisualStudio (namely a C# REPL Environment with a Fluent API for .NET and VisualStudio)
In addition to being able to write and execute quick C# snippets (in a REPL environment), you can program VisualStudio IDE in real time!
You can install it using VisualStudio's Extension Manager (search for C# REPL) or via the download link at the VisualStudio Gallery page: VisualStudio C# REPL
The VisualStudio C# REPL page also contains more details and code samples.
There is also an Reddit thread on this extension (which contains more code samples).
Let me know what you think of it