I always get excited whenever I see a good piece of software or a neat online service.
And it has a live preview for the markdown code you entered!
I’m really a believer of the live-preview thing, I think it’s especially useful when coding in markup languages (html included).
I haven’t thoroughly tested Scribble, but it really has potential. And I think it lacks of one feature – a proper hinting mechanism for the markdown markups, that will get the people (like me) who don’t know markdown tags yet started quickly.
It’s worth trying!