OK I've just got an idea that I think would be quite neat:

How about a virtual rubber duck that sits in the corner of your editor? Just like the gem in old Word, if you remember. It's yellow and quacks sometimes, and nods understandingly when you talk to it (mic monitoring).

And it also monitors your typing and says (popup text bubble) things like:
"those parentheses doesn't look balanced to me"
"did you really initialize that variable?"
"you wrote JASON again"
"you forgot the ;"

You get the point.

I don't have time to implement, feel free to steal my idea and become a millionaire.