As part of the launch for Visual Studio 2013 I wrote up a blog post with a run through of the new CodeLens feature and how it can assist in day to day development.

That article is now published and you can read it on the MVP Blog at http://blogs.msdn.com/b/mvpawardprogram/archive/2013/10/29/viewing-your-code-through-visual-studio-s-codelens.aspx

For reference, you can also find the link on the MSDN Visual Studio home page, though it won't be there for long :-)