I really love the simplicity of the Arduino IDE and the entire idea of setup()..loop(). What I REALLY would like, it to use it to write code for my Mac. Somewhat like processing, but with c++, not java.
A graphics toolkit like Adafruit's GFX library, something for keyboard & mouse events, disk library.. Away we go. Possibly even make it cross platform?
Anyway, that's my idea. I would be just tickled to have a tool like that.
-jim lee