This is such a great idea, I'd love to see it. It would be even better if one could create easily create portable apps.

I've played a bit with The GUI Loft and I'm quite impressed. The only problem I have with it is that is Win32 only.

If only there was a similar tool for wx or even Tk that was a nicely done, I'd happily suggest it. Sadly I can't think of anything to suggest.