This sucked about an hour of my life tonight. Hopefully it can help someone else (or me when I forget how I got out).I was coding along in Visual Studio 2010 on am MVC3 project, when I accidentally hit some key chord that put me into insert mode. I spent the better part of an hour trying to get out, so I thought I would post how I did it so it might help someone else.

fn+enter/return

Hope this helps. This will also serve as a reminder to myself when I get stuck again!