First: I really, really need a name for this thing. I am tired of saying "my rst2pdf previewer/editor app".
Now, here's a video of how it looks nowadays after all the yak shaving (sorry about my english, I write lots of it, but never speak it):
As you can see, the basic app is fairly complete, even if it lacks all the amenities that would make someone use it (like, search? save? ;-).
It has one big problem, though: I can't publish it yet.
I am trying to contact the author (Rajeev J Sebastian), so there should be news soon!
As soon as that's cleared, the PDF widget is a whole post by itself, because it's pretty neat, if I may say so myself.
UPDATE: the binding is now under MIT license, thanks to Rajeev Sebastian!