[est]

two-column layout is so last decade. Why hasn't anyone invented inline markdown editor yet?

Your current cursor line should be markdown source in plain text, other lines rendered HTML.

[guynamedloren]

Prose.io has kind of a hybrid markdown editor (I think it's WYSIWYM?). It has markdown syntax highlighting that happens to look similar to the final output, though the markdown tags are still displayed. They also have a toolbar, which is used like a regular WYSIWYG toolbar, but generates mardown tags.

It's pretty neat.

[voyou]

Why not render the current line in HTML too?