[DigitalJack]

I love this. Chris Granger is officially one of my heroes.

One quick suggestion: on the first time start up of the app, it goes through a brief explanation of the various parts. It might seem obvious to most, but I think it would make it a little nicer if the dialog that says "The instarepl is an area where you can write code..." had an arrow shape, or an arrow in the box pointing toward the repl.

Same for the dialog talking about the output area.

It's not so much that it's confusing, it's just an unfamiliar interface, and an arrow would be reassuring that what I thought was the repl was really indeed the repl.