I gave this a quick try and found that the workflow concept is really intriguing, but having to use canned templates is annoying.
I would love to see an app that would allow you to use a similar concept ... taking the code in a single page and saving it in the sidebar as an object, so that when it's selected just that section of code is show for editing.
Combine that with uEdits bookmarking of code system, a Webcore previewing pane, and contextually based snippet creation and inserting system and I WOULD BE SET.